1girl, arknights, bikini, bikini_under_clothes, black_bikini, breasts, cleavage, criss-cross_halter, demon_horns, groin, hair_ornament, hair_rings, halterneck, hand_up, horns, hyakutarou_(momotar0_4), large_breasts, long_sleeves, looking_at_viewer, official_alternate_costume, purple_eyes, red_hair, shirt, simple_background, solo, star_(symbol), star_hair_ornament, surtr_(arknights), surtr_(colorful_wonderland)_(arknights), swimsuit, white_background, white_shirt