Toshio, a young man who came to Tokyo for job hunting, reunites with his aunt Yayoi after a long time. Seeing how much he's grown, Yayoi feels her heart flutter. Teasing him for becoming more masculine than she expected, she playfully invites him to take a bath together. But his surprisingly composed reaction toward women intrigues her. Aroused by his indifference, she deliberately strips off her panties and flaunts her body in front of him. She attempts to steal his first kiss, masturbating right before his eyes to stoke his desire. Though she briefly snaps out of her lustful trance, Yayoi can't suppress her urges any longer—her attraction to her nephew's virginity ignites a new, uncontrollable passion.