1girl, ahoge, animal_ears, armpit_crease, black_hair, blanket, closed_mouth, collarbone, dhuten, flat_chest, hair_between_eyes, horse_ears, horse_girl, horse_tail, long_hair, lying, manhattan_cafe_(umamusume), multicolored_hair, nude, on_stomach, one_eye_closed, solo, streaked_hair, tail, umamusume, under_covers, yellow_eyes