a4 (a4 eishi), kitasan black (umamusume), umamusume, absurdres, highres, 1girl, ahoge, animal ears, bow, bowtie, breasts, collarbone, double biceps pose, ear ribbon, emphasis lines, flexing, furrowed brow, greyscale, horse ears, horse girl, looking at viewer, medium breasts, monochrome, multicolored hair, open mouth, puffy short sleeves, puffy sleeves, school uniform, short hair, short sleeves, solo, tracen school uniform