A normal household raised mother Ayano and her son Satoru. As Satoru grew older, he became captivated by his mother's warmth and softness, gradually beginning to see her as a woman. He spent his days gazing at her moist lips and tender cleavage, lost in fantasy. One day, unable to contain himself any longer, Satoru went to his mother while she was in the bath. There, he confessed his feelings. Hesitant at first, Ayano gently returned his kiss. That single moment changed their relationship forever.