Yuko Tanaka, who "married into" the Tanaka family, a family running a poultry farm, led a modest life despite being mistreated by her sister-in-law, Satomi Tanaka. One day, Saki Watanabe, the mistress of Yuko's husband, Ryosuke Tanaka, applies for a live-in employee position at the poultry farm. Unaware that Saki is her husband's mistress, Yuko, who conducts the interview, decides to hire her. Thus begins a strange cohabitation, including the husband's mistress.

At the suggestion of Yuri, Hiro arranges a party at his small bar in Shinjuku. Yuri's three high school classmates – Hiro, Kenji and Tamotsu – are also joined by Takeru, who went to the same university with Hiro and Yuri, but who Kenji and Tamotsu haven't met before. As the four men eagerly wait for Yuri to arrive, the various secrets related to the men's relationships to Yuri start to come to light.