Hatsukanezumi no Jikan

Four students at a secluded private academy for gifted children—Maki Takano, Ryo, Natsume, and Mei—have lived within its secure walls since childhood, never having seen the outside world. The arrival of a new student, Kiriko Hinatsu, unsettles Maki, who feels he has known her before, a belief no one else shares. After confronting her, Kiriko reveals that the school is an experimental facility conducting advanced neurological research on its students. Maki must choose between remaining in the comfort of his fabricated reality or aiding Kiriko in an escape that could endanger both his safety and mental well-being.