Seeking a once-in-a-lifetime experience, Oda remains a virgin. While visiting his friend's house, he encounters an unfamiliar woman—his friend's mother, Rio. Oda instantly falls for her. Overwhelmed by desire upon seeing her, he can no longer restrain himself. He sneaks a peek at her bathing and catches her masturbating in the bathroom. Successfully recording the scene without her knowledge, he devises a plan to use the footage to blackmail Rio into deflowering him. This story portrays a fleeting impulse born from pure curiosity and the emotional turmoil of a boy confronting its consequences.