1girl, arknights, armpits, arms_behind_head, arms_up, black_choker, blue_background, breasts, choker, cleavage, closed_mouth, detached_sleeves, gradient_background, hands_in_hair, horns, large_breasts, long_hair, long_sleeves, looking_at_viewer, navel, official_alternate_costume, one_eye_closed, purple_eyes, red_hair, solo, stomach, surtr_(arknights), surtr_(colorful_wonderland)_(arknights), upper_body, very_long_hair, yuukiey