1girl, ahoge, animal_ears, armpits, arms_up, bikini, blurry, blurry_background, breasts, cleavage, copano_rickey_(umamusume), halterneck, horse_ears, horse_girl, horse_tail, may9, medium_breasts, navel, purple_eyes, side-tie_bikini_bottom, signature, solo, summer, sunset, swimsuit, tail, umamusume