1girl, arknights, arm_up, bare_shoulders, black_choker, blue_sky, breasts, choker, cleavage, closed_mouth, criss-cross_halter, day, detached_sleeves, halterneck, horns, kyoro_ina, long_hair, long_sleeves, looking_at_viewer, medium_breasts, official_alternate_costume, outdoors, petals, purple_eyes, red_hair, sky, solo, sunlight, surtr_(arknights), surtr_(colorful_wonderland)_(arknights), upper_body, very_long_hair