My wife's mother's beauty is unchanging...it's been a while since we've seen it!!

Chisato's daughter Yumiko has injured her leg and comes to stay at her daughter's house to help with housework. Chisato was devoted to supporting Yumiko, but her son-in-law Shuta looked at Chisato with greater feelings than her stepmother. And when Yumiko was sleeping, it happened. Shuta, who hadn't been around since Yumiko was injured, hugged Chisato and kissed her. Chisato hesitates at the infidelity he has done by her son-in-law, but her loneliness between the masked couple gradually becomes accepting Shuta...