Apparently, she did it without knowing that the student was a yakuza woman... Sayaka Iijima, a serious and kind female teacher like a saint, goes to apologize... but her weakness is exploited and she is trained as a sex slave. Sayaka desperately endures, but she is forced to orgasm many times, and the incubus that had been sleeping in her voluptuous body appears, and she arches her back like crazy.