1girl, arknights, bad_pixiv_id, bare_shoulders, bikini, breasts, day, detached_sleeves, from_side, horns, leria_v, long_hair, long_sleeves, looking_at_viewer, looking_to_the_side, lying, medium_breasts, official_alternate_costume, on_back, one_eye_closed, outdoors, parted_lips, pillow, purple_eyes, red_hair, surtr_(arknights), surtr_(colorful_wonderland)_(arknights), swimsuit, white_sleeves