Gift: Eternal Rainbow

Amaumi Haruhiko is a high school student at Shimano Academy in the town of Narasakicho. The town is watched over by a mysterious rainbow, said to be connected to a magical wish known as the "Gift"-a once-in-a-lifetime bond shared between two people. As a child, Haruhiko was close with his childhood friend Kirino until his family took in Riko, a girl who became his non-blood sister. The two grew very close, but eventually separated when Haruhiko’s father could no longer care for both of them. Years later, Riko returns to Narasakicho and enrolls at Shimano Academy alongside Haruhiko and Kirino. The story follows their relationships while gradually uncovering the truth behind the Gift and the rainbow that hangs over their town.