Ms. Tachibana is a beautiful and stylish office lady. Contrary to her beautiful face, she's actually a power-hungry boss, berating her subordinates at work and even insulting unreliable men today. While Tachibana has a terrifying side at work, she also has a different one. Back home, she becomes slovenly, taking off her suit, masturbating, and then falling asleep. Moreover, Tachibana has a secret roommate… Kato, whom she scolds at work during the day. Although Kato isn't very good at work, Tachibana is spoiled by him at home; Kato is a smart man. The same goes for their sex life. Under Kato's guidance, her lovely girlfriend Tachibana is constantly melting. One day, she comes home late, and only Tachibana and Kato are in the office… Kato tries to seduce Tachibana, but she's in work mode. However, she can't resist, and sex begins randomly. On the desk… on the chair… Kato ejaculates inside the constantly crying Tachibana. This is a secret overtime ejaculation; I can't tell anyone.