On a day off, boyish logistics coworker Yumi Nijimura invites an older colleague for a drive. While complaining about her boyfriend, she asks to be alone with him at a hotel, then uses oral skills she has never shown her boyfriend to leave the older man helpless before sex. Alone with him, she admits her attraction and frustration over wanting a married man. Asking whether he still has time, she leads him to a second hotel, begs for creampies, and continues their secret affair.