Nishikoshi, the nephew, comes over to cheer up his aunt Erika, who is feeling down after a broken heart. Erika, who was losing her confidence as a woman, is gradually drawn to Kokoro due to his kindness as she visits him every day. From then on, she continues to stimulate Nishikoshi's desires by clinging to him in provocative clothing in an attempt to get him to notice her, or by barging in on him in the bath and sucking his erect penis in surprise and excitement. Finally, Nishikoshi begins to think of his aunt as a woman and can't help but reach out for Erika's ripe, seductive body...