One day, Takuya's father introduces him to his stepmother, Nana. However, Takuya feels that his new mother is a woman, so he spends his days trying to cover it up by being rude to her so that she doesn't notice. But he is also a man. Unable to contain his overflowing desire, he releases it by masturbating, but Nana happens to see Nana... Takuya, feeling embarrassed, Nana Nana to suck his dick. However, Nana's crotch begins to get wet due to the forcefulness, which is different from the gentle sex she usually has with her husband...