1girl, animal_ears, arm_garter, black_thighhighs, box, breasts, cleavage, daiwa_scarlet_(scarlet_nuit_etoile)_(umamusume), daiwa_scarlet_(umamusume), ear_covers, gift, gift_box, gloves, holding, holding_gift, horse_ears, horse_girl, horse_tail, long_hair, looking_at_viewer, nakahira_guy, official_alternate_costume, open_mouth, outdoors, red_gloves, red_hair, single_ear_cover, smile, solo, tail, thighhighs, tiara, umamusume