Natsume finds a black cat looks very much alike of Nyanko-sensei except fur c...
Natsume's Book of Friends
Season 2 Episode 12: Haioku no shônen
Natsume rescued Kai, a boy who was trapped in a box at an abandoned house with rumors that paranormal phenomena occur. Natsume heard that spirits are pursuing Kai, it reminds of his own childhood and he wants to protect Kai.