Five years after her husband's passing, the widow and teacher Mari struggles with unfulfilled sexual desires. Despite her profession, she maintains her sanity through daily self-pleasure six days a week. One day, to prevent three underperforming students from repeating a grade, she decides to host a three-day study camp at her home. The students, while studying diligently, are fascinated by Mari—some peek at her in the bath, others steal her underwear… etc. Mari, after a long time without male attention, feels her body ignite with forbidden desire despite knowing it's wrong.
