1girl, 2boys, alternate hairstyle, alternate universe, animal ear fluff, animal ears, arknights, arm support, black cape, black footwear, black gloves, black hair, black pants, black skirt, boots, brother and sister, buttons, cape, closed mouth, collared shirt, column, covering with clothes, cup, day, door, double-breasted, fur-trimmed footwear, gloves, gnosis (arknights), grey eyes, grey hair, hair between eyes, holding, holding clothes, holding cup, holding jacket, ikag, jacket, leopard, leopard ears, long hair, long sleeves, mountain, multicolored hair, multiple boys, outdoors, pants, paper chain, pillar, ponytail, pramanix (arknights), red hair, shirt, short hair, siblings, silverash (arknights), skirt, sky, sleeve cuffs, smile, streaked hair, sweater vest, white hair, white shirt, white sweater vest