Listening intently outside her son's room, Yumi accidentally discovers that her son's friend Jun is a virgin. In that instant, she seizes the opportunity and approaches Jun. However, to her surprise, Jun unexpectedly climaxes too soon, leaving Yumi utterly shocked by what just happened. That night, a bodysuit-clad Yumi appears in Jun's dreams, lingering in his memories. She comforts the disheartened Jun, patiently teaching him the basics of sex and wholeheartedly supporting him. The next morning, Jun feels a surge of confidence and strength welling up from within, stepping forward with a renewed sense of purpose.