1girl, arknights, bikini, black_bikini, blue_sky, closed_mouth, demon_horns, hair_rings, horns, long_hair, miike_(992058), official_alternate_costume, outdoors, palm_leaf, purple_hair, red_hair, sky, solo, star_ornament, surtr_(arknights), surtr_(colorful_wonderland)_(arknights), swimsuit, swimsuit_cover-up, thigh_strap, very_long_hair, water