Nemuri Kayama (香か山やま睡ねむり Kayama Nemuri?), also known as the 18+ Only Hero: Midnight (18禁ヒーロー ミッドナイト Jū-hachi-kin Hīrō Middonaito?),[1] is a Pro Hero and faculty member at U.A. High School, who teaches Modern Hero Art History.

She'll Be Here In Little Witch Academia/My Hero Academia Crossover Show.