1girl, arknights, black_dress, black_jacket, demon_girl, demon_horns, dress, from_behind, grey_background, holding, holding_sword, holding_weapon, horns, jacket, long_hair, looking_at_viewer, looking_back, miyanami_3, off_shoulder, open_clothes, open_jacket, purple_eyes, red_hair, simple_background, solo, surtr_(arknights), sword, twitter_username, weapon