Homeroom

Rintaro Aida is a handsome teacher. One of his students, Sachiko Sakurai endures unpleasant situations every day. The identity of the person who causes the unpleasantness is not known. Rintaro Aida always saves her from those situations. Because of this, Sachiko Sakurai begins to have feelings for her homeroom teacher. What Sachiko Sakurai does not know is that Rintaro Aida likes her very much and he is behind the unpleasant situations and he does this to save her.
(Source: AsianWiki)