Irina, the third daughter of the three Nemoto sisters, is a plain, college science student who wears a white coat and glasses at school. It seems that things are going well with her boyfriend Soga. One day, while Irina is studying ancient Japanese history, she discovers a system in which women share a man sexually.

Cast

Mutsuo Yoshioka

Sokuten Soga

Seiji Nakamitsu

Toshihiko Mitsukawa

Akika Kitagawa

Irina Nemoto

Anna Tomo

Masami Nemoto

Kyôko Kazama

Oriha Nemoto

Naohiro Hirakawa

Ginichi Kuwai