Before getting married, Nami was a tutor at a cram school. She resumed her tutoring job for the sake of the family budget after quitting due to marriage. However, while her husband is a serious workaholic, his nightlife is bland and leaves her sexually frustrated. At that time, one of her students showed her a smartphone with photos of her committing adultery, causing Nami to be shaken. From then on, she was subjected to relentless sexual harassment and coercion, not only by the student who is also her son but also by friends and her father, treating her as a submissive pet and reducing her to a sex toy.
