Naruiwa

Naruiwa is a male teacher of Sainan High school and belongs to the department of guidance.

Appeareance
He is a large man whose head is cropped and lips are fleshy.

Plot
He appears in chapter 18, during seaside school arc, where he lessoned Saruyama and his company because they attempt to intrude female rooms.

He also appears in the chapter 57 of Darkness where Rito, disguising the Principal, is seriously reported by television. Ignoring this, Naruiwa is impressed by the "Principal" and feels that "He is a man who achieves necessity".

Trivia
He doesn't appear in anime.