Atsushi arrives at a soapland, only to be greeted by none other than his stepmother, Riko. She bows with three fingers on the floor, cheerfully playing the role of a submissive hostess, leaving Atsushi visibly flustered. Faced with a situation that could destroy his family, he struggles to respond—until Riko urgently makes him an offer. "I promise to quit this place after today. So please, Atsushi… be my last customer." Is this an attempt to silence him before he tells his father, or is she simply giving in to reckless desire? Caught in an unexpected seduction by his stepmother Riko, Atsushi must now make his choice.