Natsume Takashi got the "Book of Friends" made of those contract books from the relics of his grandmother Natsume Reiko. He made an important decision: to return the names of the monsters in the Book of Friends one by one. Around such Natsume, various monsters began to gather... Natsume Takashi, a boy who can see monsters, and the monster cat teacher who looks like a lucky cat, tell everyone strange, sad, nostalgic, and touching weird stories.