Hoshino is an ordinary office lady with glasses and long bangs. One day, while working overtime, she has a physical relationship with a playboy coworker she has a crush on. Hoshino is even ashamed to show her naked body, but after having sex with him once, she is completely changed! Using techniques she learned from the erotic manga she always read, she attacks her coworker and makes him vulnerable. The roles are swapped and the relationship between the two continues to play out in the office.