1girl, arknights, bare_shoulders, black_background, black_dress, breasts, cleavage, closed_mouth, collarbone, detached_collar, dress, from_above, holding, holding_sword, holding_weapon, horns, huge_weapon, large_breasts, long_hair, looking_at_viewer, looking_up, purple_eyes, red_hair, reiya_(aisunokappu), simple_background, sleeveless, sleeveless_dress, smile, solo, surtr_(arknights), sword, very_long_hair, weapon