4koma, 5girls, animal_ears, bare_shoulders, box, brown_hair, cardboard_box, comic, female_trainer_(umamusume), horse, horse_ears, horse_girl, letter, multiple_girls, oguri_cap_(umamusume), onsen, sakazaki_freddy, school_uniform, shinko_windy_(umamusume), t.m._opera_o_(umamusume), tokai_teio_(umamusume), tracen_school_uniform, trainer_(umamusume), umamusume