Gift: Eternal Rainbow - S01

Amaumi Haruhiko is a high school student at Shimano Academy in the town of Narasakicho, where a mysterious rainbow hangs over the town. This rainbow is tied to a magical phenomenon called "Gift"-a once-in-a-lifetime wish shared between two people. As a child, Haruhiko was close with his childhood friend Kirino until his family took in Riko, a non-blood-related sister. The two grew close, but they were eventually separated when Haruhiko's father could no longer care for both of them. Years later, Riko returns to Narasakicho and, along with Kirino, enrolls at Shimano Academy. The story follows the evolving relationships between these three as they uncover the truth behind Gift and the rainbow that watches over their town.