Kimi wo Shinasenai Tame no Storia

Four students at the United Nations University—Arata, Tara, Caesar, and Louis—reside in the space-faring city known as Cocoon. As a new type of human adapted to space through neoteny, they navigate a society where all relationships are governed by contracts. Lifespans vary greatly among individuals, with some living for centuries and others far less. While in the red light district, the four encounter a girl with green hair, marking the start of their story.