yakousei a, kitasan black (umamusume), umamusume, commentary request, highres, 2girls, alternate costume, animal ears, arm up, black bow, black bowtie, black hair, black skirt, blush, bow, bowtie, confetti, frilled sleeves, frills, gloves, horse ears, horse girl, horse tail, horseshoe ornament, juliet sleeves, long sleeves, looking at viewer, multiple girls, open mouth, puffy sleeves, short hair, simple background, skirt, smile, tail, thighs, white background, white gloves, white streaks, yano hinaki