Mayu, mother's close friend, suddenly announces her marriage, leaving her son Satoru shocked and confused. Having admired her since childhood, her decision tightens his chest with emotion. Trying to stay cheerful for her final night as a single woman, Satoru puts on a bright face, though his heart wavers inside. Part of him wants to stop the wedding, but he can't bring himself to speak. Then, a visibly drunk Mayu approaches him, telling him she'll be someone else's wife tomorrow—and asking Satoru to help her create one last unforgettable memory. As the bold, big-breasted woman presses her body against him, Satoru hesitates, torn between guilt and desire, yet gradually succumbs to the moment, completely captivated.