2nd year university student, Ito Tsutomu is impotent due to an accident when he was a young child. He meets first year student Osanai Ageha at a university club. Ageha looks just like the girl that has appeared in Tsutomu's dream. Meanwhile, Ageha looks like a young woman, but she is actually 25-years-old. The two people then begin to live together.
