Season 1 Chapter 1 - 13 End
Natsume Takashi has the ability to see spirits, which he has long kept secret. However, once he inherits a strange book that belonged to his deceased grandmother, Reiko, he discovers the reason why spirits surround him. Containing the names of these spirits, a binding contract was formed between the spirits and the owner of the book. Now, Natsume is determined to free the spirits and dissolve the contracts. With the help of a spirit cat, his days are filled trying to return the names to these spirits.
Season 2 Chapter 1 - 13 End
Continuing on from the first season, Zoku Natsume Yuujinchou follows the story of Natsume, a boy who has been able to see ghosts since he was little. Unfortunately, humans shun him, and there is not much fondness between him and ghosts either. One day, he inherits a Yuujinchou ("Book of Friends") from his grandmother. The book is actually full of contracts that his grandmother made to trap ghosts. As one ghost after another shows up, Natsume tries to release or help them — even while many of them seek vengeance on him.