Banri Tada is a freshman at a Tokyo law school. After an accident, he suffers severe memory loss. Despite the incident, he befriends fellow freshman, Mitsuo Yanagisawa, which leads him to the beautiful, yet obsessive, Kouko Kaga.

Banri finds himself completely lost after the opening ceremony and tries to find his way to the freshman orientation. Along the way, he runs into another lost freshman from the same school, Mitsuo Yanagisawa, and they immediately hit it off.