1girl, 9a-91, 9a-91_(girls'_frontline), arms_up, black_skirt, blue_eyes, blue_shirt, blush, girls'_frontline, hair_ornament, jacket, long_hair, long_sleeves, looking_at_viewer, lying, navel, on_back, open_clothes, open_jacket, open_mouth, red_jacket, shirt, skirt, so_myeolchi, solo, star_(symbol), star_hair_ornament, white_hair