Youkai that first appears at episode 6 and 7 of Zoku Natsume Yuujinchou.

The second season of Natsume Yuujinchou. 
As with its prequel, Zoku Natsume Yuujinchou is about Natsume Takashi, a boy who has had the ability to see youkai since he was young, and his bodyguard youkai, Madara, nicknamed Nyanko-sensei. Natsume attempts to return names written in his Book of Friends, which he inherited from his grandmother Reiko, to youkai in his village. Throughout these adventures, he meets some youkai that are friendly, some that want to steal the Book of Friends, and some that want to kill him. Natsume learns about himself and his relationship with youkai along the way. 
(Source: MAL Rewrite)

Shigeru Nagashima, known professionally as Choo, is a Japanese actor, voice actor and narrator. His former stage name was Yuuichi Nagashima, he changed his stage name to Choo on August 23rd, 2006. He is a graduate of the Nishogakusha University Department of Literature and received training at Bungakuza's research establishment and the Seinenza Theater Company before attaching himself to Production Baobab in 1986. He transferred to the Tokyo Actor's Consumer's Cooperative Society in 2007.

Choo's hobbies include badminton and jogging, and he is a licensed calligraphy instructor.

(Source: Wikipedia)

The third season of Natsume Yuujinchou. 
Takashi Natsume has always been shunned by those around him because of his mysterious ability to see yokai. Eventually, he came into possession of his grandmother Reiko’s “Book of Friends,” and together with his bodyguard Nyanko-sensei he set out to return the names of the yokai contained within it. Since then, he’s found a home with the Fujiwaras and surrounded himself with friends at school. Little does he know he's about to be dragged unwittingly into further trouble... 
(Source: NIS America)

The fourth season of Natsume Yuujinchou. 
 
Still in possession of his grandmother's Book of Friends, Natsume spends his days returning the names of yokai to their rightful owners. He has been learning how to deal with the yokai and humans that surround his life, but the time has come for him to deal with something even more difficult — his own past, and future. 
(Source: NIS America)

This anime DVD has a completely original story not told in the manga or its earlier anime adaptations.
 
Note: Given to subscribers of LaLa and LaLa DX magazines.
 
(Source: AniDB)

The fifth season of Natsume Yuujinchou.

When Reiko was Takashi's age, she bound the names of demons and spirits in her Book of Friends, enslaving them to her capricious whim. Now Takashi is the owner of the book, and the creatures will do anything to get their names back.
 
(Source: Viz Media)

The sixth season of Natsume Yuujinchou.

Two special episodes bundled in the fourth and fifth volume of the Blu-ray/DVD.


Natsume has been busy, navigating between humans and Yokai when he coincidentally reunites with an old classmate, Yuki. It brings back painful memories of a certain Yokai. Meanwhile, Natsume also became acquainted with Yorie Tsumura, a woman in the memories of a Yokai whose name he had returned. Yorie knew much about Reiko, but now lived a peaceful life with her only son, Mukuo. Being with this family was comforting for Natsume, but apparently a mysterious Yokai has been lurking in their town. 

On the way back from investigating, a “Yokai seed” that had latched itself to Nyanko Sensei drops into the Fujiwaras’ garden and grows overnight into a fruit tree. When Nyanko Sensei eats a fruit that is somehow shaped like himself, he suddenly splits into three! 
(Source: Aniplex USA)

In "Ishi Okoshi," Natsume meets a small youkai called Mitsumi in a forest. Mitsumi is entrusted to wake up the divine youkai "Iwatetsu" from its deep slumber. Mitsumi weighs on Natsume's mind, so he sets out to help Mitsumi with his task.
 
In "Ayashiki Raihousha," a mysterious visitor appears in front of Tanuma. Nearly every day, the visitor visits Tanuma, talks to him a little, and then leaves. Natsume, who knows the visitor is a youkai, worries for Tanuma, but Tanuma enjoys these exchanges with the youkai. The youkai means no harm, but Tanuma's health slowly starts to deteriorate.
 
(Source: Anime News Network)

The seventh season of Natsume Yuujinchou.

Chobi-hige