The story of a certain mother. Chisato Shoda is a mother of one child, living with her son, Yasuhiro. Six months have passed since her divorce from her husband. After the divorce, she no longer feels the ups and downs of her overly playful, hedonistic, and free-spirited husband. However, for her son, who is approaching puberty, the change in his home environment seems to have been a considerable shock, and he has become withdrawn. Looking back on her son's current situation, Chisato realizes that as he has grown older, she has been letting him indulge less and less. Looking back on herself, who was originally good at letting her son indulge, she regrets not letting him indulge because of her home environment. At the same time, the more she thinks about her son, the more she realizes that her love for him has drastically changed from maternal love to romantic love... The story is linked at key points to the work "Mizusawa Mao, a beautiful female teacher who is an over-the-top sex instructor who grabs hold of the male hearts and dicks of the students she teaches."