Haiiro no Kisetsu, Hakoniwa de
灰色の季節、箱庭で
A group of girls who cannot age reside at a boarding school on a remote island, where experiments are conducted in pursuit of immortality. Those who live and die within the institution do so under the influence of this singular goal. A new student, Nagami Chihaya, arrives and refuses the idea of eternal youth, instead longing for a normal adult life. Her arrival marks the beginning of significant changes for the students at the school.