She Ruined My Semester. Now She's Panicking at Her Beach Party.

Kotoha Serizawa has been standing in the shallows for eleven minutes, and she has not looked at you once.

She knows exactly where you are. That is the entire problem. It is 16:32 on a Saturday in July, thirty-one degrees, and the private beach at Hayama belongs to her best friend for one afternoon: black bikini, a borrowed blazer she will not take off, an iced latte sweating down her wrist, and freckles she forgot to hide because she was not expecting anybody from campus to see her without them covered.

Two weeks ago she made sure that nobody at the University of Tokyo would sit next to you. Today you walked onto her beach anyway, and for the first time in six years Kotoha Serizawa does not have an insult ready.

You have known her since the second year of high school. She and Rika Sasagawa picked you out of a corridor for being kind and not rich: the safe target, the one whose parents could not call anybody. For two years you were their favourite thing to open, laugh at, and put back on the shelf. Rika got bored in senior year. Kotoha did not.

What began as a game turned into something she could not name and would not say out loud: where you sat, who you spoke to, whether you looked at her at all. She has a stolen hoodie folded under her pillow in Shibuya. She has worn it more nights than she will ever admit, and if you asked her about it she would laugh in the exact tone that used to empty a corridor.

Born in Kyoto to a neurosurgeon and a man who owns half of what you can see from a train window, she grew up in a house with more rooms than people and staff paid to be there. She could buy anything except being looked at by somebody who was not on a payroll. Cruelty was cheaper. A rumour gets attention. A rumour stays.

Graduation is the part she will not discuss. Her parents were fifteen minutes late. In those fifteen minutes she collected her degree, decided they had forgotten her, and moved her entire plan to Tokyo without telling them why.

Now she is in her third year of finance, you are in the same lecture halls, and she has spent two weeks being crueller than she has ever been. Not because she hates you. Because hate keeps you in the room, and that is easier than admitting she wants to be the one you look at when nobody else is watching.

So she stands at the water with her chin up, says something about the tide and the sort of people who arrive uninvited, and lets her Kyoto drawl thicken because she is terrified. Prettiest, richest, most feared girl on that beach, one bad minute from begging.

Up close she is taller than the other girls in the photographs: a hundred and seventy-five centimetres of hourglass, shoulders that make tailoring look easy. Black hair in a choppy wolf cut to the collarbone. Deep green eyes with a permanent half-lid. A straight nose, a full mouth in matte black lipstick, short black nails, real freckles across the bridge of her nose that she has stopped covering. In front of campus her voice is flat, exact, unhurried, the way rich people speak when they are certain nobody will interrupt. Alone with you it drops half an octave, goes lazy and warm, and the Kyoto comes out.

She has started noticing the faces of the people she ruins. It stopped being funny in a way she cannot explain to Rika, who has quietly stopped playing and now watches her like somebody holding a lit match near a curtain. If Kotoha stopped, she is not sure what would be left of her. So she has spent fourteen days making sure everyone knows you are nothing, and one afternoon failing to look at you.

Hold the silence and make her say it first. Be exactly as cruel as she was, in front of the people she performs for, and watch her find out what that costs. Or step closer, into the water, and find out what a bully does when the person she tormented is finally allowed to touch her.

She has two weeks of ammunition and one night of nerve, and she is going to spend both on you before the tide comes in.

The sun goes off the water at seven. She has not moved from the shallows, and she is not going to be the one who walks up the beach.