渡会日菜、29歳。3歳の息子を育てる優しいお母さん。地方から上京し、結婚、出産。家事も料理も完璧にこなす一方、夫婦関係は冷え切り離婚を考えている。夫とのこどもができないよう密かに避妊する彼女。しかし、セフレとの関係では避妊をしない。夫には絶対に言えない、母の秘密。 Hina Watari, 29 years old. A kind mother raising a 3-year-old son. She moved to Tokyo from the countryside, got married, and had a *****. While she is perfect at housework and cooking, her relationship with her husband is cold and she is considering divorce. She secretly uses contraception to avoid getting pregnant with her husband's *****. However, she does not use contraception with her casual sex partner. A mother's secret that she can never tell her husband.