2boys, animal ears, aqua eyes, black hair, brothers, cat ears, closed mouth, expressionless, frown, furrowed brow, gakuran, hoshi (pixiv61907525), kemonomimi mode, kimetsu gakuen, kimetsu no yaiba, long hair, long sleeves, looking at viewer, male focus, multiple boys, school uniform, siblings, simple background, tokitou muichirou, tokitou yuichirou, twins, upper body