Kuroshitsuji: Midori no Majo-hen / 黒執事 -緑の魔女編-

By the Queen's orders, Sebastian and Ciel head to Germany to investigate mysterious deaths that have been occurring. As the two investigate the truth behind the "Werewolf Forest," where anyone who steps foot inside is cursed to death, a terrible curse falls upon them. (Source: Official site, translated)...