Her husband calls her saying that he can't come home today because he's at work again... Angered, Rino throws away the food she was cooking and takes it out on her son... However, her son takes pity on his mother and offers to make dinner for her... Rino is touched by her kind son and ends up kissing him... At first her son is surprised, but he comes to understand his mother's sexual urges that her husband doesn't care about, and he gently accepts her as a woman... From that night, when her husband is away at work, her son makes dinner for his mother, and the mother and son become a mother and daughter who are both physically satisfied and have a naughty sexual relationship...