1girl, ahoge, alternate_costume, animal_ears, beach, bikini, black_hair, blush, breasts, cleavage, collarbone, flower, hair_flower, hair_ornament, hibiscus, horse_ears, horse_girl, horse_tail, kitasan_black_(umamusume), medium_breasts, navel, ocean, open_mouth, outdoors, saboten_mushi, solo, swimsuit, tail, towel, umamusume