A popular princess is attending school and every guy falls in love with her, including the main character, Asakura Kengo, who gets a letter to meet her after school. Through some magic spells, Kengo is accidentally transformed into a "cute" tentacle monster by the princess. In order to fix her mistake, she offers to help him return to his human body. But now, Kengo has a bigger problem. He must learn to control his urge to tentacle rape the women around him.