touhou, kochiya sanae, karasawa-40, 1girl, ahoge, ass, black legwear, dirty, dripping, from behind, green hair, indoors, loafers, long hair, nopan, panties removed, pantsu, peeping, poster (object), sailor collar, school uniform, serafuku, shirt, shoes, short sleeves, skirt, skirt lift, slip-on shoes, solo, squatting, squat toilet, tile floor, tiles, tile wall, toilet, toilet paper, trash can, underwear, urinating, urine, white shirt