There is a story called Cow Head, and almost no one alive can tell you how it goes. That is the whole point of it. The few people who ever heard the story all the way to the end did not survive to repeat it, and so the story keeps itself secret.

What people pass around instead is not the story. It is what the story does to the person who dares to tell it.

There is one version everyone seems to know. A schoolteacher was on a long bus trip with his class. The children were bored and restless, and they kept begging him for something frightening, so at last he smiled and gave in. "All right," he said. "I know one. It is called Cow Head."

He managed only the first few sentences. Then his voice changed. It went flat and strange, as though he was no longer choosing the words, as though the words were simply pouring out of him on their own. His face turned pale and wet with sweat, and his hands gripped the seat in front of him so hard that his knuckles turned white. He wanted to stop. Everyone could see that he wanted to stop. He could not.

At the front of the bus, the driver slowly slumped forward over the wheel, and the bus rolled off the road and came to a halt by itself. And still the teacher kept talking, the terrible story spilling out of him into the silent, frozen bus.

When the passengers woke, several hours had passed, and no one could say where the time had gone. The teacher was alive, but only just, slumped in his seat, foaming at the mouth, his lips still moving without making a sound. He never told the rest of that story to anyone, for as long as he lived. Some say he never spoke properly again at all.

Every version of Cow Head ends the same way. Someone begins it. No one is ever allowed to finish it. They say it was written down once, long ago, and that every copy was burned, the ashes buried, and the ground above them sealed, just to be sure. That is why you will never read it, and you should be glad. Because the danger was never the cow, and it was never the head. The danger is the next word, the one already forming, quietly, somewhere behind your teeth.

On paper, people say, the poem is harmless. It is only ink and quiet paper. The danger begins the moment you give it your voice and read it out loud.

The poem tells the story of a little boy named Tomino, who is sent down into hell. He goes looking for his older sister, somewhere in the dark below, climbing down and down, past cages full of birds that sing and never stop, down past seven mountains and seven valleys, far further than any living person should ever go. No one is supposed to follow him there. That is the whole point. When you read the poem out loud, line by line, you are following him.

The people who have done it describe the same things afterward, when they are willing to describe anything at all. First the cold, a draft moving through a room with no open window. Then the feeling that the room has grown longer behind them. And near the end, the worst part: their own voice slows down and steadies and stops sounding like their own, as though someone has quietly sat down behind their shoulder and begun to read along.

The clearest warning we have is a video. A man decided to record himself reading the whole poem aloud, to prove there was nothing to it. For the first minute he is calm, almost bored. Then, slowly, he begins to change. He shifts in his chair. He looks up from the page, once, then again, and then he keeps glancing toward the corners of the room, as if he can hear something the microphone cannot. His reading grows quieter. His eyes stop following the words on the page.

In the last thirty seconds, he goes completely still. He is staring at something low in the corner, off to his left, that the camera never shows. He stares for a long, long time, and his face is the face of a man looking at something that should not be in the room with him. He does not scream. He does not finish the poem. He simply reaches out, very carefully, and closes the book, and switches the camera off. He never read the rest of it, not that night and not ever. Whatever he saw, he decided that never knowing how the poem ends was the safer thing to live with.

That is the part that should frighten you most. Not a man who died reading it, but a grown man who would rather stop forever than say the next line.

The poem is real, and old, and still out there in the world. We have chosen not to print it inside this book. Some doors are not ours to open for you. But if you truly mean to risk it, it is not hard to find: look for "Tomino's Hell" by the poet Saijō Yaso, from his 1919 collection Sakin. When you do, read it the way you have read this story, with your eyes only, and not a single sound. Whatever happens after that is yours.

It was only fifteen seconds long. The commercial aired a handful of times, always late at night, long after midnight, and then it was gone. On the screen, a small child in a red ogre costume sat on a lawn so green it looked wet, while somewhere off camera a woman sang something soft and slow in a language that was not Japanese. That was the whole of it. Nobody who saw it could say why it left them so uneasy. They only knew that it did, the way a smell can seem wrong for a second before your mind catches up and understands what it is.

The frightening part is not the commercial. It is the three people who made it, and what became of each one.

The child went first. A few months after the commercial stopped airing, the little one who had worn the red costume was hit by a car on a quiet street near home, and did not survive.

The singer went next. She was a foreign woman, flown in to record the song, and not long after the session she simply stopped being anywhere. She never made her flight home. She left nothing behind and was never seen again, the kind of missing-person case that stays open for decades and quietly leads nowhere.

The last was the man who had approved the commercial for broadcast. He hanged himself, alone, in a locked room. The detail the few surviving crew cannot let go of is that the television was on when he was found, and the fifteen-second commercial was playing on the screen, on a channel that had not aired it in more than a year.

Years later, someone went looking for the original recording. Not for the curse. They wanted to find the singer, to put the rumor to rest, to prove she was alive somewhere and the whole thing was nonsense. So they sat down and played the tape again, slowly, to study the song and trace the language she had been singing. And the language was Japanese. Plain, clear, unmistakable Japanese, words that had not been there before. And it was not her voice. It was a different woman entirely, one none of them knew, singing words none of them had ever written.

Except there had only ever been one singer in that booth. One woman, one session, one voice on the master tape. No overdub, no second recording, no one else in the building that night, and they checked all of it. The song had simply changed, on a tape that had sat untouched in a drawer for years, into a different language in a different voice. The people who heard what it was singing now, plain and clear in Japanese, will not repeat the words. They will only say that it was no longer a song, and that whatever it had become, it knew they were listening.

You wake at exactly 4:44 in the morning, and you do not know why. The room is dark, and the television is on, and you did not leave it on.

There is no channel and no program, nothing that belongs on the air at this hour. The screen is split down the middle. On the right is a list of names, scrolling slowly upward, and a voice is reading them out, one at a time, calm and patient. Ta-na-ka. Hi-ro-shi. Each name given its full weight, each one followed by a number that, after the third or fourth, you understand is an age. On the left is a single photograph of a face, and every time the voice finishes a name the picture changes to the next person, so that the face on the left always belongs to whoever the voice has just spoken.

They are not the photographs people keep. Nobody is posed, and nobody is smiling. Each person is shown in the exact state in which they died, and the screen lingers on every one of them without flinching, and after a moment you realize that you are not flinching either.

Some part of you knows at once that this is wrong, that no station broadcasts this, that the only right thing to do is get up and walk out of the room. But the voice keeps reading in that even, gentle tone, and the list keeps climbing with no end to it that you can see, and the longer you sit there the more you have to know how far it runs, and whose names are on it, and how close it has come to the names you know. Somewhere in the dark your phone begins to ring, and you do not answer it. You only keep watching. That is the whole trap, and it is built out of nothing but your own wanting to see.

In the morning, some of those names are in the paper, in the small notices at the back that nobody ever reads. Died in their sleep. Died suddenly. The same names, in the same order the voice read them, hours before anyone alive could have known.

So the next night, when you wake at 4:44 and the television is on again, you already understand what you are looking at. And this time you understand the rest of it: the list does not stop at the people who are already gone. It keeps going, past tonight, into tomorrow and the day after, name by name by name, and if you stay and follow it long enough, the voice will reach your own.

Here is the only thing the story tells you, and it tells you once, so listen. The moment you understand what is on that screen, do not keep watching. Get up. Whatever it costs you, however heavy you feel, put your feet on the floor, cross the room, and pull the television out of the wall. Because if you stay, and you let the list climb, you will hear your own name read out slowly in that calm, patient voice, and the photograph on the left will change to you. It will not be a picture of you as you are now, sitting up in the dark. It will be the picture of how you die. And once the screen has shown you that, there is nothing left to undo. The ones who stayed to look were found the next morning sitting up in front of a television that was switched off, eyes open, already wearing the face from their own photograph. The only version of this story that anyone walks away from is the one where they got up in time.

It is very late, and you are almost alone on the platform, waiting for the last train of the night. The lights at the far end of the station have already been switched off, and the announcements have stopped. There is only you, and, down near the dark end, one other person. A small boy in a school uniform, standing right at the edge, his toes over the yellow line, staring down at the tracks as though he has dropped something into the dark between the rails.

You should keep to yourself and wait for your train. But he is so small, and standing so close to the edge, and there is no station staff left to pull him back if he leans too far. So you walk down toward him, and you ask him, as gently as you can, whether he is all right.

He does not turn around. He says he is looking for something. He dropped it onto the tracks, he says, and he has been trying to reach it for a very long time. His notebook. His school notebook. He needs to get it back.

You follow his gaze down, and there it is, lying open in the gravel between the rails: a child's notebook, its pages somehow clean and dry in all that grime. There is a small drawing on the open page, and a few lines of writing beneath it. You lean out a little over the edge to read what it says.

It is a lost-and-found form, the kind every schoolchild in Japan fills in. A line for the item that was lost, written out carefully in round, childish handwriting: my head. A line for the date, which is today's date. And a line for the name of the person who lost it.

The name is yours.

Not a similar name. Not a common name that could belong to anyone. Your name, your family name and your given name, in handwriting you recognize, because it is your own. The way you wrote it in elementary school, before your hand grew up.

You are still trying to understand this when you notice the boy has turned to face you. And that is when you finally see him. He has no head. He never did. There is only the dark collar of his uniform and the cold night air above it.

Before you can step back, two small cold hands press against you and shove, and you go off the edge. As you fall, you see the white light swelling in the mouth of the tunnel, and you hear the last train arriving, exactly on time. The form was filled out before you ever reached the station. All the boy needed was for you to come down the platform and confirm it.

You are walking home late on a rainy night, the last stretch after the last train, down a quiet street with no one else on it. You have no umbrella. The rain has soaked through everything you are wearing, so you keep your head down and just try to get home.

That is when you see her, a little way ahead, standing still under a streetlight. A woman in a white kimono, holding a red umbrella open over her shoulder. She is perfectly dry. Not damp, not dripping. Dry, as though the rain has simply agreed not to touch her. And she is already turned toward you, watching you come, as if she has been standing there waiting for exactly this. For you, on exactly this night.

As you reach her, she smiles, and she offers, very softly, to share her umbrella. She is gentle and kind, and you are cold and soaked and tired, and the rain is so loud. That is the whole trick of it. The people who say yes, who step in under the red umbrella to walk beside her, are found later somewhere they had no reason to be, far off any path they would ever take. They are dry. They are smiling. They have been dead for some time, and yet, when they are found, their bodies are still warm.

So you do the sensible thing. You shake your head, you say no thank you, and you keep walking, head down, into the rain.

That is when you hear it behind you. A small, sharp tapping. The metal tip of an umbrella, touching the wet pavement. Tap. Tap. Tap. Keeping perfect pace with your steps. It never catches up to you, and it never falls behind. It follows you the whole way home, around every corner, right up to your door.

You get inside. You lock the door, and you check it twice, and the tapping stops at the threshold like a guest with good manners. You tell yourself it was only the rain. For a week, you almost believe it.

Then you come home one clear evening, and there is a red umbrella standing in your entryway. Closed. Upright. Resting against the wall among your own shoes, as if it has always lived there. It is wet. It is dripping a small dark ring onto the floor, though the sky has been empty and blue for days, and your door was locked, and you checked it twice, and it was.

You did not take the umbrella. You said no. But the rain that falls around her does not seem to care what you said, because that night, lying in bed, you hear it begin: not tapping this time, but rain, soft and steady, falling somewhere inside the house. And beneath it, unhurried, something climbing the stairs.

The first thing is the sound. A boy is spending the summer with his grandparents, out where the houses sit far apart and the rice runs up to the hills, and he is in the garden in the long light of early evening when it comes from the other side of the fence. A low voice, flat and empty, with no warmth of any person in it. Po. Po. Po. Over and over, patient, almost like laughter with everything human boiled out of it.

He looks up, because of course he does, and over the top of the fence, which stands taller than a grown man, there is a head. A woman, looking down at him. She wears white, an old-fashioned white dress and a wide pale hat, and she is smiling, and she is far too tall. The fence reaches past most people's eyes. It does not reach her chest. She must be eight feet from the ground to the crown of that hat, and she stands there looking down at a small boy in a garden, smiling, going po, po, po, and the boy's body understands before his mind does that he has to be inside, now, and he runs.

When he tells his grandfather what he saw, the old man's face does something the boy has never seen an adult's face do. It empties out. The grandfather makes two phone calls in a voice the boy is not allowed to hear, and then the rules begin. They put the boy in a back room and cover the windows. They paste strips of paper inked with prayers over the door and across the walls, pour a ring of coarse salt along the threshold, and set a small dish of rice and a stone statue in the corner. He is told the rules once, plainly, the way you tell a child something you cannot afford for them to get wrong. Do not go outside until the sun is up and we come for you. Do not open the door. And whatever you hear out there, whatever voice it uses, do not answer it.

The night is very long. For a while there is only his own heartbeat. Then, late, the sound finds the room. Po. Po. Po, just outside the wall, close enough to touch if the wall were not there. It circles. He hears it pass the window, the door, the far wall, and come round again, unhurried, all night, as if it has all the time that has ever existed. And then it stops being patient, and it starts to use voices. His grandfather's voice, telling him it is morning, come out now, it's safe. His mother's voice, from a house hundreds of miles away, asking him to open the door, just for a second, just to see her face. The voices are almost perfect. Almost. There is a flatness under each one, the same dead note as the po, po, po, and it is the only thing that saves him, because everything in his body is begging him to answer, to open the door, to let his mother in. He bites down on his own arm until it bleeds and he stays silent.

At the first gray of dawn the prayers go quiet outside, and his grandfather, the real one, peels the paper off the door and carries him out through the back of the house with a cloth over his head so he cannot see the fields, and drives him fast out of the district and does not stop for a long time. The boy lives. That is the version with a happy ending, and it is the one people tell, because the others are unbearable.

In the others the family is too late, or the child answers just once, or there is no grandfather left who knows the old ways. There the legend goes quiet in the way that lets you fill the silence yourself, except for the one thing it always says. The child is found within a few days. Not far away. Sitting, usually, somewhere they could not have climbed to alone, a high branch, a sealed room, the middle of a field with no footprints leading in. Whole, and unmarked, and emptied of every drop of blood, drawn out slowly across one long night by something that was in no hurry at all. And smiling. Wearing her smile now, the one from over the fence, fixed on a small face that will never make any other expression again.

A convenience store is the safest place in Japan at three o'clock in the morning. It is lit as brightly as a hospital room. It never closes. There is one clerk behind the counter and a camera watching from every corner. That is exactly why this story is so frightening, because it happens in the one place where nothing bad is ever supposed to happen.

The clerks who have seen it all tell it the same way, in the same flat voice. A figure comes in from the empty street. It is too thin to be a real person, although it is shaped like one. Its joints bend the wrong way, and always a moment too late, as though something is reading instructions on how a human body is supposed to move and getting them very nearly right. It crosses the floor to the counter the way a puppet would cross a stage. It does not buy anything. It leans in close, close enough to breathe on you, and says three words, flat and quiet and final. Inochi o kure. Give me lives. And then it waits, very politely, for an answer.

The clerks who run away are always fine. The clerks who freeze, who do the polite and well-trained thing and stay at their post, are simply not there when the morning shift arrives. The register is open. The shift is half finished. There is no sign of a struggle, and no sign of the clerk, and no sign that anyone had been standing there at all an hour before.

And here is the detail the clerks hate to talk about, the one they will only give you if you keep them talking long past the point where they should stop. The cameras never capture it. There are hours of clean, boring footage of the clerk standing alone, smiling slightly, speaking very politely to no one at all, nodding at the empty air in front of the counter. Then there is a single frame in which the clerk is gone. Not walking away. Not turning. Simply gone, the way a name is crossed off a list. And days later, it comes back to the same store, at the same hour, carrying in its thin arms whatever it took the last time, holding it up so that you can see it, so that you understand what kind of exchange this is. And then, as patient as ever, it asks again.

In 2005, a man in Shimane Prefecture posted a story on a Japanese message board. He was not trying to frighten anyone. He wrote like a man filing a report, and that is what makes it hard to put down.

He and a few friends were helping clear out an old family property in the countryside. In a storage shed, under decades of dust, one of them found a wooden box about the size of a lunchbox. It was beautiful. Dark, dense wood. Interlocking pieces fitted together so tightly you could not see how it opened, or whether it opened at all. The friend turned it over in his hands, admiring the joinery, and said he wanted to take it home for his daughter.

An older man from the neighborhood had come by to help. When he saw what the friend was holding, he stopped moving. Then he told him, very quietly, to put it on the ground and step away from it. Not to drop it. To put it down gently, and to step away.

They laughed at first. He did not.

What he told them, once they were outside, was not a ghost story. It was a family instruction, the kind passed from father to son with the understanding that it should never be written down. In the 1860s, he said, the area held a small settlement of people the surrounding villages treated as less than human. They could not trade fairly. They could not marry out. Their children died of hunger at a rate everyone knew about and no one discussed.

One year, a stranger came through the settlement, fleeing from something he would not name. In exchange for shelter, he taught them a craft. How to build a box that carried a grudge.

The box had to be made a certain way, and it had to be filled a certain way. What went inside came from children. Blood from a stillborn child. A fingertip from a living one, taken while the child was still alive, because the box did not work otherwise. The village had no shortage of dead and dying children. For the first time, even their losses could be made useful.

The finished box was called a kotoribako, a child-take box. You did not keep it. You gave it. Slipped it into the home of a family from one of the villages that had spent generations grinding yours down. Nothing happened at first. That was important. A curse that strikes too quickly teaches people what to fear. Then the women in the house began to sicken. Then the children. Doctors found nothing, because there was nothing to find. It took months. The men were left alive to watch, because that was the point.

The boxes were graded by what had gone into them. One child. Two. Four. The old man said the one in the shed had been made with eight, a class so dangerous that even the people who built it became afraid of their own work. It was never delivered. It was sealed away instead, and one family in each generation was given the job of keeping it isolated until its strength wore out. That was believed to take about one hundred and forty years.

The men did the arithmetic standing in the yard. The years had not passed yet.

The posts describe what happened next in the flat tone of someone still inside the problem. Phone calls to families who were supposed to be watching other boxes. The discovery that some had moved house, died, or simply stopped believing. The realization that not every box could be located anymore. And one detail the narrator mentions almost in passing, the way you mention a thing you cannot yet afford to think about: the friend's wife had been in the car with the box on the drive home. By that evening, she was describing a pain low in her abdomen that would not stop.

The thread ends without an ending. The missing boxes were never accounted for. Somewhere, if you believe the story, a handful of small wooden puzzles are sitting in Japanese homes right now. In drawers. On shelves. In storage rooms no one has opened for years. Waiting out a countdown that only one family per box was ever supposed to remember.

She was very young. The boyfriend who had gotten her pregnant had been seeing someone else the entire time, and she had no idea at all what a person was supposed to do with any of it. So when the baby came, her panic reached for the only plan it could find. She wrapped the baby up. She carried the small, warm bundle to the train station. She put coins into a locker, placed the baby inside, and closed the door.

She told herself a story so that her legs would keep walking. Someone would hear it crying. Someone would open that little door, lift the baby out, and carry it home, and it would be safe, and loved, and better off than it would have been with her. She lived nearby. She would somehow know when the happy ending arrived.

For weeks she walked past that bank of lockers and watched, out of the corner of her eye, for police tape, or a gathered crowd, or any sign at all that something had been found. There was never anything. The lockers stayed shut, and silver, and silent. So she let herself believe that no news was good news, that nothing happening meant the kind thing had happened. She was young. People believed worse things than that in those years, and walked away with clean hands.

She grew older. There was a different man, a gentle one this time. There was a small wedding. And years later she was pregnant again, this time happily, heavy and slow and full of joy, walking across that same station hall, when she heard a child crying somewhere ahead of her.

It was a little boy, standing alone on the platform. The strange thing was not the boy. The strange thing was the crowd. It flowed around the place where he stood as though that space were empty. No one slowed down. No one looked at him. No one else seemed to hear what she was hearing. Of course she went to him; her whole body was already leaning toward the sound before her mind had agreed to move. She crouched down to his level. She reached out her hand. She began to say something soft and warm, the kind of thing you say to a frightened child.

The boy went quiet all at once. He looked up at her, calm, not blinking, with an expression that no small child should be able to make. And he said: it was you.

They found her three days later. The same station. The same row of lockers. Something was leaking out from underneath one small steel door, slow and dark, spreading across the floor. There was a small handprint pressed against the outside of the door, pressing outward, from the inside. It took two officers and a crowbar to force it open. What they found folded inside that locker, packed into a space far too small for any grown woman's body to fit, was her.