Every weekend the company holds a so-called social drinking party. Yuki, a recent hire who hates drinking events, dreads each one because his boss Mizuno practically forces him to join the karaoke after-party. One Friday, everyone except Yuki declines, leaving him alone with her. He plans to leave quickly, but Mizuno suddenly slides her glossy black-stockinged foot toward his crotch, turning their private karaoke session into a drunken affair with creampie sex.