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