Teacher, let's play a game together. Ayane Tachibana, who was assigned to Ataku Academy as a temporary teacher, decided to challenge Takeda, a student who is absent from school but has a genius mind, to a game proposed by Takeda in order to somehow get him to come to school. "If you win, you will come to school as you wish. But if you lose this game... you will have to take off your clothes." Ayane hesitated in front of the unreasonable exchange conditions, and Takeda's game began.