A high school first year named Niike has a habit of being forgetful and doing too many favors for others. Her classmates ask her to drop off some materials to Nemoto, a boy in her class who has been absent from school. It is said that Nemoto lives alone in his house, but as Niike approaches the residence, she senses the lingering presence of something unusual. This encounter becomes the catalyst for Niike to embark on a journey to rediscover parts of herself she has forgotten, all while unraveling the mysteries connected to this reclusive boy.

The story takes place in a small seaside town in Hokkaido, which provides a backdrop of distant horizons and changing seasons for this growing mystery. Niike, sometimes referred to as Nike in other translations, must navigate her ordinary school life while being drawn into an increasingly strange and surreal situation. Nemoto, the boy who rarely shows his face in class, is a central figure initially presented as a shut-in, but the circumstances of his isolation conceal something more profound.

As the narrative progresses, the quiet coastal setting contrasts with the emotional and psychological gusts that sweep through the characters lives. The monthly serialization follows Niike as she attempts to reach out to Nemoto, pushing past the physical and emotional barriers that keep him confined. The series is noted for marking a return to serialization for the creator after a long hiatus, blending dramatic tension with the slow-burn rhythms typical of a shojo manga.