1girl, arknights, armpits, bare_shoulders, blush, breasts, choker, cleavage, criss-cross_halter, detached_sleeves, eichi_(yashokuya), hair_between_eyes, hair_rings, halterneck, horns, large_breasts, long_hair, long_sleeves, looking_at_viewer, official_alternate_costume, purple_eyes, red_hair, solo, surtr_(arknights), surtr_(colorful_wonderland)_(arknights), swimsuit, teaspoon, teeth, upper_body, very_long_hair