When his parents get busy, Kenji is sent to live with his aunt Yu. However, Kenji is obsessed with Yu's attractive adult body, especially her curves and buttocks, and begins to think about making her his own. Kenji peeks at her as she changes clothes, and when Yuu son Satoru is out, he fondles her breasts. And although frustrated, Yuu is confused, she also starts to feel aroused by Kenji's actions...