Manyû sanshimai: Ire kui rankô (2007)

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.

• Parental Guidance: PG-13
• Release Date: 2007-03-23
• Runtime: 1h 0min
• Production Company: Tantan-Sha Company
• Production Country: Japan
• Director: Sachi Hamano
• Writer: Kuninori Yamazaki