1girl, arknights, bare_shoulders, barefoot, bikini, black_bikini, black_choker, black_ribbon, breasts, choker, cleavage, closed_mouth, criss-cross_halter, crossed_ankles, day, detached_sleeves, feet, hair_rings, halterneck, horns, knees_up, kotoba_(610430468), long_hair, long_sleeves, looking_at_viewer, medium_breasts, navel, official_alternate_costume, outdoors, purple_eyes, red_hair, ribbon, side-tie_bikini_bottom, sitting, smile, solo, surtr_(arknights), surtr_(colorful_wonderland)_(arknights), swimsuit, swimsuit_cover-up, thigh_strap