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?),[1] was a Pro Hero and faculty member at U.A. High School, who taught Modern Hero Art History.