Kiichiro, 74, and his 62-year-old wife Akane live quietly and poorly in their old age in downtown Tokyo. Having lost all their savings to medical expenses, and facing social scorn and hardship, the couple decide to take up a hunting rifle inherited from their late father and attack the home of a wealthy family, but their plan takes an unexpected turn for the worse.

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.