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.

養鶏場を営む⽥中家に”嫁いだ”⽥中優⼦は、夫の姉である⽥中⾥実にいびられながらも、慎ましく⽇々の⽣活を送っていた。そんなある⽇、優⼦の夫である⽥中良介の不倫相⼿、渡辺咲が養鶏場の住み込み従業員の募集に応募する形で⽥中家を訪れる。⾯接を担当した優⼦は、咲が夫の不倫相⼿だとは知らずに採⽤を決めてしまう。かくして夫の不倫相⼿を交えた奇妙な共同⽣活が始まる…。