makabakabakama, theresa (arknights), theresis (arknights), arknights, chinese commentary, commentary request, highres, 1boy, 1girl, armor, back-to-back, black background, black horns, brother and sister, cape, closed mouth, demon boy, demon horns, furrowed brow, hands up, holding, holding sword, holding weapon, horns, long hair, looking at viewer, male focus, pink hair, pointy ears, red cape, serious, short hair, siblings, sword, upper body, weapon