Junta Momonari is a young High School boy from the modern times, who has a terrible girl "allergy" Each time he is in a situation where he sees a girl in any sort of sexual light (undressed, or in any stage of undress) he becomes nauseous and vomits... Karin, however, changes him to the Mega-Playboy, and he no longer suffers from this regularly... Especially not while using his "Mega-Play" power.