sei (bigaa), agnes tachyon (umamusume), umamusume, absurdres, highres, 1girl, animal ears, black shirt, black shoes, brown hair, brown jacket, brown skirt, closed mouth, fur jacket, hair between eyes, horse ears, horse girl, horse tail, jacket, looking at viewer, plaid clothes, plaid skirt, red eyes, shirt, shoes, short hair, skirt, sleeves past fingers, sleeves past wrists, solo, tail, turtleneck, turtleneck shirt