Ryuji Keikain and Mamiru Keikain, two onmyoji who are powerful enough to take down even Aotabo, have arrived in Ukiyoe Town. Seeing all yokai as absolute evil, the two proceed to hunt down yokai when they encounter Rikuo and Yura.

Ryuji Keikain uses his Shikigami “Gyogen” to attack Rikuo, who defends himself with his blade. Ryuji halts his attack when he recognizes the blade as “Nenekirimaru,” a Spirit Blade that can only cut down yokai. He then tells Yura, his sister, the real reason why he came to Ukiyoe Town.

During the era when the Toyotomi clan ruled Japan, there lived a young woman known as Princess Yo, who could heal any wound or disease with her magical powers. Used as a tool for making money by her greedy father, Princess Yo was confined within the estate like a caged bird. Having taken an interest in the princess, a young Nurarihyon decides to sneak her off the estate.

Nurarihyon enters Osaka Castle to rescue Princess Yo from Hagoromo-Gitsune, the Lord of Pandemonium. But Hagoromo-Gitsune, whose power grows through the number of times she has been reincarnated, overwhelms Nurarihyon with her immense powers.

Kiyotsugu proposes that the Kiyojuji Paranormal Patrol members visit Yura’s home in Kyoto as part of a summer yokai research project. But when Rikuo tells Nurarihyon of his intentions to go to Kyoto, his grandfather’s expression suddenly turns stern.

At Oshu-Tono’s Hidden Village, Rikuo spends his days in intense training. Under his instructor Itaku’s supervision, Rikuo slowly begins to master Kyokasuigetsu, the “Fear” of Nurarihyon.

In Kyoto, the Keikain seals are broken one after another by Hagoromo-Gitsune. Meanwhile, Rikuo continues to train at Tono Village to build strength against the Kyoto yokai when he receives news of the Kyoto’s onmyoji being annihilated.

Rikuo completes his training and returns to Ukiyoe Town with the Tono-Yokai. Seeing the progress his grandson has made, Nurarihyon allows Rikuo to go to Kyoto, as well as promising him the title of the Nura Clan’s Third Heir upon his safe return.

Yura and Ryuji are forced to fight Akifusa, whose strong desire to become the head of the Keikain Clan has led him to being taken control of by Hagoromo-Gitsune’s yokai.

The Kyoto Yokai are moments away from fulfilling their long-standing wish with only one seal remaining to break. Meanwhile, Rikuo and his clan members on board the Treasure Ship are about to enter Kyoto from above when Hakuzozu, one of Hagoromo-Gitsune’s yokai, gets in the way.

The Nura clan’s Treasure Ship sustains heavy damage by the Kyoto yokai and begins to lose altitude, forcing Rikuo and his clan to make a desperate attempt to prevent it from crash landing in Kyoto.

A look back on past events as the Nura clan, Tono yokai, and Keikain onmyoji get ready for their upcoming showdown with Hagoromo-Gitsune and her Kyoto yokai.

At Fushime-Inari Shrine, Awashima the Amanojaku falls into a trap set by the Kyoto yokai 27-Faced-Senju-Mukade. Now, Awashima must use “Possession” to cut through the enemy’s “Fear.”

Having reunited with Yura, Rikuo is introduced to Hidemoto Keikain, the 13th Heir. But the Keikain onmyoji and Nura clan members are suddenly attacked by Tsuchi-Gumo, an ayakashi who seeks only to fight the strongest.

Rikuo is left severely beaten by Tsuchi-Gumo, when Gyuki arrives to take him to Mt. Kurama for treatment. There, Gyuki tells Rikuo that in order to become stronger, he must embrace his human side and surpass the “Fear” of his grandfather Nurarihyon.

Hagoromo-Gitsune takes up residency in Nijo castle, having destroyed all eight of the onmyoji seals. Now, the onmyoji and Nura clan must try to get past the Kyoto yokai in order to reseal the area.

As the battle in Kyoto intensifies, the Keikain onmyoji and the Nura clan yokai realize that only by working together can they become a match against the Kyoto yokai. Meanwhile, Rikuo continues his training at Mt. Kurama, where he must discover what is necessary to become stronger.

During his training with Gyuki, Rikuo learns that by accepting his human side, and believing in his allies, he can become stronger. Completing his training, Rikuo then sets out to save Tsurara from Tsuchi-Gumo by using the technique of the Lord of a Hundred Demons, “Equip.”

The battle between Rikuo and Tsuchi-Gumo reaches its climax. Meanwhile, Nurarihyon enters Nijo Castle to confront Hagoromo-Gitsune for the first time in 400 years, where he discovers the evil existence that the Kyoto yokai are trying to bring forth.