1girl, arknights, beach, bikini, black_bikini, black_choker, blush, breasts, choker, cleavage, closed_mouth, cowboy_shot, day, demon_horns, detached_sleeves, expressionless, hair_intakes, hair_ornament, hammock, horns, long_hair, looking_at_viewer, medium_breasts, navel, ocean, official_alternate_costume, outdoors, purple_eyes, red_hair, side-tie_bikini_bottom, slit_pupils, solo, star_(symbol), star_hair_ornament, stomach, surtr_(arknights), surtr_(colorful_wonderland)_(arknights), swimsuit, sword, thigh_strap, weapon, white_bikini, ykuu_yousei