1girl, animal_ears, bad_pixiv_id, bare_arms, bare_shoulders, black_hair, blue_one-piece_swimsuit, blush, breasts, closed_mouth, competition_school_swimsuit, ears_down, fourth_wall, gameplay_mechanics, grey_eyes, grey_hair, ha_(hura76752775), horse_ears, horse_girl, horse_tail, indoors, long_hair, motion_lines, multicolored_hair, oguri_cap_(umamusume), one-piece_swimsuit, pool, school_swimsuit, shaking_head, small_breasts, solo_focus, swimsuit, tail, through_screen, tracen_swimsuit, two-tone_hair, umamusume, very_long_hair, water, white_hair, window