Karin, a DNA operator from the future, is on a mission to alter the course of history by preventing Junta Momonari from becoming the Mega-Playboy who fathered 100 children and caused global overpopulation. However, Junta is not a playboy; in fact, he is allergic to girls. When Karin accidentally shoots him with the wrong DNA-altering bullet, he begins to sporadically transform into the Mega-Playboy, capable of charming any woman. Karin must attempt to restore normalcy before this transformation becomes irreversible.