Nagi Umino, a 16-year-old super-student and second-year student at Meguro River Academy, was switched at birth. On his way to visit his birth parents for dinner, he meets Erika Amano, a bold, opinionated woman who is determined to make Nagi her phony lover because she never wants to marry. However, once Nagi arrives at dinner, he discovers that his parents have decided to address the hospital switch by having him marry the daughter his biological parents raised...who happens to be Erika herself!