Yuzu is an unlucky girl who caught a cold on the day of her high school entrance ceremony. When she finally returns to school, her best friend Saori tells her that she has the school's biggest delinquent, Ren Shidou, in her class. Yuzu, who is ordinary and longs for a normal high school life, dismisses the story as nothing to do with her, but she runs into Ren, who is injured under a cherry tree. Yuzu is frightened, but still treats his wounds, then, Ren forcibly calls for her after school...?