Transfer student Shi Yu Tetsu came to Shiosaka, a small seaside town. He thought he was just changing schools, but he heard the sound of "the sea" on his first day of school. Someone asked for help in the wall of the old school building, and someone outside the dormitory door called him to open the door in the voice of his deceased mother. In the foggy night in the port area, the clammy "resurgence man" was walking toward him step by step with the help of a familiar face.
And all of this is related to the white bone patterns that gradually appeared under his collarbone.
Mio Kamishiro, the senior member of the student council, and Rinto Shiraishi, a dangerous and unpredictable person, all seem to have known the truth for a long time; there is even a "no-go list" hidden in the school that cannot be made public. The sound of tides, salt marks, mimicry, old files... Shiyu Tetsu gradually discovered that he was not the person who accidentally ran into strange things, but the target of being "recognized" by the sea.
When people outside the window begin to find his seat, and when the voice of the dead calls out his name over and over again, he must figure out before he loses control completely: what did his mother hide from him back then, and where exactly did Hai want to take him.
