Nina has a boyfriend, her work is going well, and she seems to be living a happy life, but she is dissatisfied with her sex life. Her boyfriend has a low libido, and her proud figure is wasted every day. One day, her boss, Oshima, asks her for sex, and although she is reluctant, she opens her legs. She thought her relationship with her boss was just work, but her physical compatibility with him is excellent, and before she knows it, she has multiple affairs and is becoming a lewd woman. Late at night in the executive office, her J-cup breasts are pressed against the glass by a forceful back-fuck. Nina is once again aroused by extramarital sex.