Otaru Yuto’s younger sisters are the most talked-about beautiful twin sisters in town. The twin sister, Otaru Yuri, is an honor student, and the twin sister, Otaru Kairi, is a blonde-haired gal. One night, the beautiful sisters overhear their parents talking in the living room about the shocking fact that the twin sisters and Yuto are not related by blood. The color of their eyes gradually changes, as they have loved their older brother Yuto since they were little ……?