Futako no Imouto (双子の妹) is a supporting character in Natsume's Book of Friends: Nyanko-sensei & The First Errand, voiced in Japanese by Hime Akieda. The series' music includes "Natsume Yujin-cho - Opening 1 | Issei no Sei", "Natsume Yuujinchou Ending Song 1".
