1girl, alternate_costume, animal_ears, black_hair, blush, breasts, buruma, floor, hair_between_eyes, hair_ornament, hairclip, hand_on_own_stomach, horse_ears, horse_girl, horse_tail, indoors, lens_flare, long_hair, looking_at_viewer, lying, medium_breasts, mejiro_dober_(umamusume), nakahira_guy, on_back, open_mouth, purple_eyes, short_sleeves, solo, tail, tracen_training_uniform, umamusume, wooden_floor