1girl, arknights, armpits, arms_up, bikini, black_bikini, black_choker, black_ribbon, breasts, burnt_clothes, choker, cleavage, collarbone, criss-cross_halter, detached_sleeves, halterneck, horns, large_breasts, long_hair, long_sleeves, looking_at_viewer, navel, official_alternate_costume, on_floor, open_mouth, pool_ladder, purple_eyes, red_hair, ribbon, shugo_15, side-tie_bikini_bottom, sitting, slit_pupils, solo, stomach, surtr_(arknights), surtr_(colorful_wonderland)_(arknights), swimsuit, swimsuit_cover-up, thigh_strap, very_long_hair, wooden_floor