1girl, =_=, animal_ears, bare_shoulders, blue_background, blue_one-piece_swimsuit, blush, book, covering_mouth, double_thumbs_up, ear_covers, ear_ornament, green_eyes, grey_hair, hair_ornament, hishi_miracle_(umamusume), holding, holding_book, horse_ears, horse_girl, looking_at_viewer, medium_hair, one-piece_swimsuit, one_eye_closed, pool, portrait, school_swimsuit, school_uniform, simple_background, solo, swimsuit, thumbs_up, tracen_school_uniform, tracen_swimsuit, umamusume, upper_body, yonedatomo_mizu