Natsume's Book of Friends - Season 4 (2012)

A spirit Yobiko asks Natsume to call a spirit Karikami using "The Book of Friends". Yobiko wants to be able to read old unreadable letters with Karikami's ability.

In the town Natsume used to live in, a girl recalls Natsume. She remembers his strange actions and wanted to understand him. Meanwhile, Natsume encounters a small Youkai which reminds him of the same girl and town.

Natsume is trapped in a bottle by a youkai to be offered to another named Omibashira.

Natsume is saved by Tanuma and the two escape from the banquet hall with the help of Natori, who was disguised as a youkai.

Nyanko-sensei falls into a well and discovers that there is a barrier inside it, as well as Nanase, Matoba's assistant.

Natori is tasked with the job of finding and breaking the seal of Houzukigami, a god that was to participate in the Moon-Splitting Festival done every 10 years against Fuzukigami, another god.

Natsume is pretending to be the god Houzukigami, so the moon splitting festival will end with a victory and the mountain will not be ruined. Winning the contest will not be easy, but with help from Natori he will find the way.

Natsume looks back at a photo of his parents, and old wounds are reopened. Natsume is having a fun day with his friends, but all of a sudden he gets a phone call.

Natsume, accompanied by Nyanko-sensei, set out to visit his old home. He visits a relative to pick up the key to the house, but is being followed by a youkai who wants him to draw a mouth for it.

A dangerous spirits Mushikui enters into Natsume's mind, and lets him to dream about sad memories when he lived at Miyoko's house.