Fifteen-year-old Shun Ayase has no interest in the blooming girls at school or the enticing models featured in porn magazines. Instead, he lusts for his own mother, Hitomi. For a 34-year-old, she retains her youthful, seductive body and enchanting smile. Regrettably, Hitomi only has eyes for her husband. However, as he frequently travels to London—leaving his wife unsatisfied and home alone with their son—an invaluable opportunity arises for Shun to manifest his fantasized taboo relationship with his mother.