Ishiki Momoko has raised her only son, Shuichi, alone, and the boy has become somewhat spoiled and selfish. One day, Shuichi steals money from his classmate Himori, who, offended, visits his mother and demands an apology. Once again, the overprotective mother, Momoko, apologizes to Shuichi for the incident and gives him his money back, but that is not enough, and he demands sex from her. This then escalated into a gangbang with the help of his classmates… much to Shuichi's dismay.