Sayaka Takagi never imagined her actions would deeply stir her son's emotions. While her husband was away on a business trip, loneliness led to a misunderstanding between her and her son, after which he began relentlessly desiring her. Sayaka repeatedly tried to put an end to the relationship, but her son refused to listen. Instead, she gradually found herself drawn to his touch, and the two crossed the forbidden line. Eventually, her son began pursuing her even when her husband was present at home...