Naughty but Nice

Kakeru's homeroom teacher, Wakasa, is very popular with the female students and is known for being, "super nice." However, one day, Kakeru sees his teacher, who is supposedly "so nice he could never hurt a fly," in the middle of a fight! On top of that, he then finds himself carrying the knocked-unconscious Wakasa home! Is this guy really a nice, kind homeroom teacher, or is he, in reality, someone quite naughty in more ways than one?