1girl, o, animal_ears, ass, back, bare_arms, bare_shoulders, bikini, bikini_skirt, blue_sky, blush, breasts, brown_hair, cowboy_shot, daiwa_scarlet_(trifle_vacation)_(umamusume), daiwa_scarlet_(umamusume), day, from_behind, hair_intakes, horse_ears, horse_girl, horse_tail, kirou_(kiruyuu1210), large_breasts, layered_skirt, long_hair, looking_at_viewer, looking_back, low_twintails, ocean, official_alternate_costume, outdoors, parted_lips, red_bikini, red_eyes, red_skirt, skirt, sky, solo, swimsuit, tail, twintails, umamusume, very_long_hair, water