"I won't forgive that woman."

Nanako, who is being bullied at her daughter-in-law's place of work, finds that her part-time job is the only place where she can be at peace.
Her mother's friend's husband, Shinobu, her boss at work, is famous for his loving wife, and Nanako envies him, but an incident leads her to cross the line with him.

Meanwhile, Kaori, Shinobu's wife, notices that her husband has been acting strangely lately.
Her husband has been having an affair with their daughter's mother's friend, a part-time woman who works at her husband's office.
What is the decision that Kaori makes for her adulterous husband and his mother's friend, Nanako?
A story of two women whose lives are drastically changed by adultery.