Season 6

Natsume's town is visited by a stonewasher: a powerful magical being capable of purifying tainted rocks. The stonewasher is looking for its lost student, and turns to Natsume for help.

Natsume gets a call from his old "friend" Shibata, who he once helped with a youkai problem. Shibata wants him to come visit, and Natsume reluctantly agrees. He and Tanuma pay Shibata a visit, and have a pleasant chat at a park. But when Shibata mentions a local haunted house, Natsume finds his visit has turned into more than he expected...

Natsume watches a movie starring Natori, and when he's done he finds one of Natori's paper dolls. The doll is soaked and the text on it is impossible to read, and Natsume becomes concerned for Natori's safety. He travels to the location that's just barely legible on the doll, and finds a young woman whose home is haunted by not one, but three youkai.

Natsume finds that Tsukiko's home is haunted by not one, but three separate youkai, each with its own motivations. One wants to protect Tsukiko's father, and the other two... Natori wants to exorcise them and protect Tsukiko, but Natsume wants to find some way to protect them. Is there a peaceful solution?

Natsume's friends reflect on how they met him, and the difference he made in their lives. He's found a home, and he means a lot to the people who live there.

Natsume meets a youkai named Gomochi, who has come in search of Reiko. The youkai has a message for Reiko, and wants to thank her for a favor she did him long ago. In hearing his story, Natsume comes to learn more about his mysterious grandmother.

Natsume is on his way home when he finds a letter on the ground. The letter seems to belong to a nearby man, who asks Natsume to take him to his school. The man is actually a youkai, who was once deeply involved with a human girl. He cut the relationship off, but the girl isn't ready to give up...

Natsume travels to an inn for a study session with the rest of his class. While he's there, a flood washes away a local shrine. The shrine is said to house three masks, but Natsume can see four...

Natori's group searches the Hakozaki mansion for the study. But other forces want the powerful magics contained within, and Natsume doesn't want them to have it...