High school student Natsunari Tokita cherishes his girlfriend Ai Momose above everything else. Then one day, Nozomi Yomiya — a girl who once attended the same juvenile detention facility as Natsunari — stabs Ai to death. Speechless from the sudden shock, Natsunari hears Nozomi call his name — and her voice carries a strange warmth, almost nostalgic, impossibly gentle… From that day on, the personalities of Ai and Nozomi begin to swap inside Nozomi’s body. Torn between his beloved girlfriend and the murderer he deeply resents, can Natsunari still bring himself to keep on loving? A youth love-suspense story depicting the madness of obsession, salvation, and romance — now begins.