genzo nasu, aston machan (umamusume), umamusume, highres, 1girl, animal ears, blue sailor collar, blue shorts, blush, breasts, brown hair, closed mouth, ear ornament, gloves, green eyes, hair between eyes, hat, heart, horse ears, horse girl, horse tail, large breasts, looking at viewer, medium hair, neckerchief, one eye closed, red neckerchief, sailor collar, sailor hat, sailor shirt, shirt, short sleeves, shorts, simple background, smile, solo, tail, white gloves, white shirt