Since losing her husband when her son Kazumasa was still a small child, Hisayo has been raising him on her own. Thanks to the love she showered on him in place of his father, Kazumasa grew up straight and did not turn to delinquency. However, Hisayo was worried that his love for his mother was too strong, and she wished that he would somehow develop an interest in the opposite sex. But her wish was in vain, and when Hisayo came home drunk after a drinking party, Kazumasa couldn't contain his overflowing feelings for his mother as he looked after her...