The Kurosawa household is quiet, just like any other night, with the usual rhythm of daily life. Yet in Reiko's room, as the night deepens, she lies alone on her bed, unable to suppress the swirling emotions deep within her heart. Her husband has always been the family's pillar, but it's been a year since he began frequently traveling for work. Amid these repeated absences, Reiko feels overwhelmed by loneliness and isolation. One night, seeking a powerful pleasure and fulfillment she can't achieve through masturbation alone, she sneaks into her sleeping son's room. In the darkness of the room, she wets her son's groin, releasing the long-buried desires hidden deep within her soul. That night, Reiko is swept into a new whirlwind of emotion.