waku, asakura ryoko, suzumiya haruhi no yuuutsu, 00s, 1girl, arms at sides, black hair, black shoes, blood, bloody knife, bloody weapon, blue hair, blue skirt, dark background, disembodied head, female focus, from behind, full body, half updo, holding, holding detached head, holding weapon, kneehighs, knife, long hair, long sleeves, school uniform, serafuku, shoes, skirt, socks, solo, standing, straight hair, very long hair, weapon, white socks, yandere