Naruiwa is a male teacher of Sainan High school and belongs to the department of guidance.
He is a large man whose head is cropped and lips are fleshy.
He appears in seaside school and lessoned Saruyama and his company because they attempt to intrude female rooms.
He also appears in the chapter 57 of Darkness,
and when Rito disguising the principal is seriously reported by television, he is impressed by the Principal, but who is disguised by Rito, and feels that "He is a man who achieves necessity."
He doesn't appear in anime.