Natsuko, a social studies teacher who has been assigned to a boys' school for the fifth year, is witnessed by Igarashi, a student in her homeroom class, who commits an injustice with a colleague who committed for temporary pleasure. Natsuko is forced to become Igarashi's pet as a condition of closing her mouth. Although Igarashi's shameful orders are constantly resisted during class and during the test, the body begins to feel joy.
