At a major bank, there works a diligent bank clerk named Takeuchi Hitomi. She has not been with anyone other than her husband for over 13 years. Dissatisfied with her current situation where she only has sex with her husband for pregnancy efforts, she applied herself, saying, "I don't want to end as a woman before becoming a mother." Filled with a sense of transgression for her first ever extramarital sex, she revealed a side of herself that couldn't be imagined from her daytime appearance.
