Sensei wa Sonna Koto Oshietenai!

A divorced high school teacher in his early 30s, Masaki Tsuji, experiences repeated unwanted physical contact on his daily train commute. Initially dismissing it as an accident, he becomes increasingly unsettled as the incidents continue. Meanwhile, one of his students, Souta, submits a blank test. During a private conversation after class, Souta unexpectedly kisses Masaki and asks if he has been a victim of groping. After receiving an affirmative response, Souta takes control of the situation, tying Masaki up and initiating a physical relationship. The narrative centers on the clandestine dynamic between the older teacher and his student.