1girl, arknights, bare_shoulders, bikini, breasts, cleavage, closed_eyes, hair_rings, horns, long_hair, navel, outdoors, pipidan, red_hair, side-tie_bikini_bottom, solo, stomach, surtr_(arknights), surtr_(colorful_wonderland)_(arknights), swimsuit, thigh_strap, thighs, very_long_hair, wading, water