Natsume meets the very first Yokai whose name was written in the Book of Friends.

Midterms are over, and Natsume leaves on a trip with Nishimura, Kitamoto, and Sasada. He realizes that the scenery he's viewing from the train is from one of the places he grew up in, when he was passed around from one family to the next. He'd thought he didn't have any good memories of the time, but then he remembers what happened when he lived there...

Natsume, Natori and Matoba work to complete the ritual to welcome a powerful god.

Touko and Shigeru are the kind elderly couple who took in Natsume when no one else would. But what were they like before they let Natsume move in?

On a rainy day, Natsume meets a young girl youkai. Her name isn't in the Book of Friends, but she wants his help anyway: she wants him to find a man she met once. The man couldn't see youkai normally, but a mischievous trick of the weather let him see her for just one day. For the next fifty years she visited him, hoping he'd see her one more time, but he never did. Now he's vanished. Can Natsume find him for her?

Chobi is depressed because his favorite comb broke. Meanwhile, Natsume sees a white dragon in the sky...

A youkai from Natsume past has found him and memories of living with relatives before the Fujiwaras are explored.

Natsume is possessed by a spirit. Obsessed with returning home, he remembers the events that occured just after his father's death.

Natsume arrives at the exorcist meeting to help smoke out the youkai that Matoba wants to find. But he quickly discovers that the situation is more complicated than it first seemed. The youkai is capable of replicating itself to possess targets, and no one but Natsume is able to see who is possessed. Natsume and Nyanko-sensei search the halls, still unsure if they even want to be there.

Natsume takes in a strange origami doll that shows wonderful dreams.

Natsume continues to spend his days giving back Youkai their names from the book of friends. One day, as he's heading home, he finds himself chased by a giant, rolling pot. The youkai in the pot insists that his grandmother Reiko stole a doll from her. When she threatens to hurt his family, however, he's forced to go out and find it. But would his kind, smiling grandmother Reiko really steal a doll from someone?

An old classmate Yuriko, remembers her time watching Natsume and how he was a little weird. A clingbug from Natsume's past reminds him of the time he spent running from a youkai with a grudge.

Tanuma gives Natsume some clay, and he tries his hand at sculpting a figure. However, the next day, the figure has disappeared, and other strange things are happening in the house. Is a Yōkai causing mischief in the house? Or is it just a rat?

Natsume overhears whispers that a powerful youkai is reviving, later that evening he is trapped in a bottle as an offering. Humans can't see or hear him, so Nyanko-sensei decides to help the “best” way he can…

Natsume helps a youkai out of a pot, and as a "reward", is made young again. But Natsume is already young, and making him younger just confuses him and addles his memories. When he doesn't know who to trust, will he have the strength to know who his real friends are?

The youkai hold a party to celebrate Natsume. Things get out of hand when they ask Natsume for a human game, and he suggests Shadow Tag. When Nyanko-sensei becomes "it", he starts stomping youkai left and right. And then Misuzu-sama, the 100 foot tall youkai, shows up...

Natsume is at home early one evening when he hears a knock on the door. He sees Tohko outside, asking to be let in. But when he opens the door, there's nobody there, and a gust of wind rushes past. Another Youkai is after the book of friends!

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 finds himself in a house with a strange ritual, and unknown forces moving against those who would perform it.

Natsume goes to a hot spring for a school trip, with an errand from Shigeru to pick up teacups from a near by pottery. While there he meets and helps a little fox spirit, who quickly grows attached to him.

Taki's brother suddenly comes home from college, and has something very important on his mind...

Natsume meets Matoba in an unusual place. Matoba hunts for a dangerous yokai at an abandoned mansion.

Natsume is forced to help rebuild a tiny house that's a residence for a goddess.

Natsume is going home for the last time, but first he must stop by his relative's house to get the key. But he is cautious, as inside is a youkai that tormented Natsume, and a girl that has always resented him.

While outside during school Natsume is hit with a ball while reading. He goes to retrieve the ball and ends up breaking a Youkai's seal (much like he had with Nyanko-sensei). Later that night Natsume and Nyanko-sensei discover a look-a-like of Nyanko, only to have him steal the Book Of Friends!

Natsume meets a spirit who used to be friends with a man who could also see spirits, but one day lost this ability.

Natsume and his friends go to a distant hot springs to help with the renovations. When he arrives, he meets an old friend of Tanumas, but he quickly gets caught up in local youkai trouble. Tanuma's old friend is actually a youkai, and she threatens terrible things if Natsume reveals her secret.

After a brief incident in the forest, Tanuma has become distant to Natsume like he is avoiding something. In the meantime, there is something breaking glass around the school.

Natsume comes across an old ticket in Reiko's belongings and decides to go to the abandoned train station to see why she kept it. There, he meets a slow witted spirit named Santo, who was waiting for Reiko the entire time to go Kiriganuma, to see and make up with his friend, Mikuri, but the trip isn't as easy as it first seems...

At a house rumored to be haunted by ghosts, Natsume hears the voice of a child. Following the voice to its source, Natsume finds a child named Kai, who is trapped in a casket-like box. Kai tells Natsume that he someone is chasing him every day.

Tanuma is experiencing how Natsume lives every day. While Natsume and the youkai gain an understanding.

Tanuma finds out Nyanko-Sensei is a spirit. Tanuma and Natsume enjoy the autumn festival and previous acquaintances are seen again.

There is a new girl in school Taki Tooru. And with her appearance at school comes these strange circles in the ground. Much like UFO circles. As Natsume tries to figure out the circles and Taki he is visited by another Youkai. Only this time the Youkai isn't looking for his name, but for a snack.

Natsume, Kitamoto and Nishimura take a trip to an old inn to spend some quality time doing their homework. Surrounding the inn is a lake; that is believed to be home to a mermaid.

Natsume finds out who's been stealing the youkai blood: the exorcist Matoba Seiji. He investigates with the help of Natori, but is captured by Matoba's servant youkai. Matoba is willing to sacrifice any number of youkai for his own ambitions. He tells Natsume why he's gathering blood: to release the seal on a powerful youkai. Natsume learns that there are people who treat Youkai in a totally different way than he or even Natori.

Natsume's friend Taki lives in a house filled with traps and mazes for youkai. She can't see the youkai herself without the aid of a special circle, but she can hear them when they're trapped in her house. She saves one of them, but it refuses to leave her home. Natsume suspects that there may be danger involved, and visits her to make sure that everything is okay.

When Natsume finally has enough of Nyanko's behavior Nyanko leaves, wandering about by himself and causing trouble.

Natsume's secret is found out by Sasada, the class president, during the "Trial of Courage." She asks for his help to find the spirit that lives in the abandoned school. Natsume denies the fact that he can see anything, but she won't take no for an answer. Meanwhile, the spirit, Shigure, captures the rest of their school mates, in fury of the school being torn down...

While fooling around in the snow, Natsume and Nyanko-sensei run in to Gen, a forest guardian who lives inside a statue. Gen tries to take over Natsume's body, but instead takes over a snow rabbit that Natsume had made. Gen pleads Natsume to help him find an evil spirit who destroyed Sui, his guardian partner, and Natsume agrees. But it seems Gen isn't telling everything he should...

Natsume is approached by someone he knew from elementary school. He wants nothing to do with them, but they threaten to reveal his secret: that he can see Youkai, if he doesn't come along with them. He reluctantly goes with them, and is taken to meet a strange girl...

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 discovers that the heirloom "Book of Friends" that his grandmother, Reiko, gave him possesses the names of the spirits she defeated and bound to her will. Assisted by a cat whom Natsume addresses as Nyanko-Sensei (lit. Master Little Meow), Natsume aims to return all of the names to their rightful owners.

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...

From the day that a picture of a row of cherry trees in a desolate winter was obtained, every time Natsume wakes up, his rooms is covered in petals. Trying to solve the root of this activity, Natsume and Nyako Sensei try and return the picture to Miya, a shadowy figure who accompanies the picture. But why can't they return it to Miya...?

Natsume is walking home one day when he's accosted by a flying Tengu, who lifts him up into the sky! Meanwhile, Nyanko-sensei is stuck in a well, where Nanase tells him a story about how she learned to never get close to a youkai.

Natsume is visited by the village's local god who is currently fading because of the lack of devotees.

Natori's family has always been exorcists... until they lost the abililty to see youkai. After generations of fearing the youkai's revenge, Natori is suddenly born with the ability to see them. His family doesnt want anything to do with his powers, though, and he's left to figure out how to live on his own. His life changes when he meets a young Matoba at an exorcist gathering, and the two of them end up hunting a powerful youkai together...

Natsume helps clean the stoeroom at Taki's house with Tanuma. He realizes that one of the kimonos that her grandfather, who researched youkai, used to ward off demons was missing, but decides not to tell them so they won't be scared. But that kimono was an old doll youkai, who was trying to recover its body which was torn apart when her grandfather sealed it

Natsume meets a popular actor named Natori Shuuichi who can also see spirits, and has a side job as an exorcist.

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 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 accosted by a spirit who asks for her brother's name back. She says that both of them have come from the village of floating spring, a paradise sealed off from the land of men. Meanwhile, the local Youkai are happy that the local priest is no longer in his temple. Natsume worries for his friend Tanuma, the priest's son, but isn't sure what to say...