Tsurugi finally gets to see his biological father after ten years, only to find him a decrepit shadow of his former self. Shortly after, Hibiki has to leave town for a week on business, and Tsurugi has seven days delicious payback in store for the accomplice to her sins against his father. Tatsuki, however, has hatched a plan to snatch his wedding ring back from his stepson's clutches before his wife notices it's gone. Who will win out in the end?