1girl, animal_ears, armpits, black_hair, black_thighhighs, blue_eyes, bob_cut, boris_(noborhys), breasts, detached_sleeves, eishin_flash_(umamusume), frills, horse_ears, horse_girl, horse_tail, open_mouth, running, short_hair, skirt, solo, sweat, tail, thighhighs, umamusume