The protagonist tracks down his student, Ursula, who has been skipping school to enjoy the nightlife and manipulate men for money. To convince her to return to her studies, he enters into a series of provocative games involving karaoke and sexual endurance. Despite Ursula's attempts to lure him into becoming her exclusive pet, the protagonist's desire to assist other demi-human girls leads to a passionate reconciliation, eventually persuading the proud dragon leader to return to school.