Natsume's Book of Friends

The Moon-Splitting Festival (4x9)

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Every 10 years the followers of Houdzuigami and Fudzukigami have a battle to determine the fate of the land. Natsume is approached by the followers of Houdzukigami to act as their missing god. Natori has been given the job of finding the missing god or seal Fuduzkigami before he wins.