1girl, arknights, arm_up, bikini, breasts, cleavage, demon_horns, detached_sleeves, horns, large_breasts, long_hair, looking_at_viewer, musicatopos, navel, official_alternate_costume, purple_eyes, red_hair, solo, surtr_(arknights), surtr_(colorful_wonderland)_(arknights), swimsuit, thighs, wet, white_bikini