Half a year into their cohabitation, Shisa and Mizuki get along well, but their sex life is always led by Shisa, leaving Mizuki feeling stuck in a rut and anxious about drifting into a sexless relationship. Desperate for change, she starts obsessively reading online articles, gets lured by an advertisement, and impulsively buys adult toys. Right after her purchase, rumors about Shisa's infidelity begin to spread, igniting Mizuki's possessiveness and jealousy. Unable to hold back any longer, she snaps and aggressively takes the initiative with Shisa in a passionate confrontation.