When 'Atsuhiko' came to live with his wife's parents, she was looking forward to seeing the big breast of 'Kimiko' in her niece. One day, Atsuhiko accidentally saw Kimiko masturbating in her pants, and he couldn't help but feel that she was patient. Kimiko will eventually feel the feeling of her family, but she will also feel delighted to be jealous of Atsuhiko.