riho, an office lady and wife living apart from her husband on a business trip, keeps her marriage a secret from her colleagues, especially the disliked boss, sasagawa. despite his daily harassment and abuse, riho finds herself strangely aroused each time he scolds her. one night, after being asked to stay late, riho notices sasagawa's desk and is drawn to it, masturbating. suddenly, sasagawa returns and catches her in the act.