Ashiya is sent to deliver a scroll to the Executive at the Legislator's request. On the way, Ashiya runs into a yokai who looks like a giant beast. He attempts to flee, but when he learns the yokai is more considerate than he looks, he is relieved. After finding a lost object for the yokai, Ashiya hitches a ride on the back of the yokai to the Executive's Birdcage, since they happen to be going to the same place. In reality, this yokai is--

After a discussion with Zenko, Abeno and Ashiya head to a shrine where a yokai is rumored to appear, and Ashiya is suddenly possessed by one! Sasa the yokai has been trapped inside a tiny shrine for many years by a golden-eyed and golden-haired human with the ability to use his "influence," which allowed him to overpower the strongest of yokai. Sasa reveals their evil intentions when they see Abeno, a human who looks quite similar to the one who robbed them of their freedom. Abeno uses his influence to knock out the possessed Ashiya, but it only increases Sasa's hatred... Later, Ashiya regains consciousness, but his unusual behavior and cold eyes remind Abeno of another person--

After hearing about the human formerly employed by the Mononokean from Komon, Abeno decides to confirm the yokai's story. The Legislator tells Abeno there may be still be some record of him at White Sand Prison. Abeno enters White Sand Prison and finds some possibly relevant documents, but written in them is... Meanwhile, Ashiya arrives at Zenko's family's temple to discuss a yokai problem, where he coincidentally hears from Yahiko that he's met Ashiya Sakae before--

Komon hires Abeno and Ashiya to exorcise the five bird yokai they've been taking care of. However, because the youngest yokai Chungo is unable to fly and unlikely to be able to handle living in the Underworld, he'll be staying with Komon. Komon nearly falls from the bridge where the yokai practice flying, but is pulled back up to safety by Chungo, who is supposedly unable to fly. Abeno realizes something is amiss. Why was Chungo pretending he couldn't fly--?

Abeno travels to the Underworld to investigate Ashiya's father Sakae, but he's unable to find any conclusive information. The cultural festival at Abeno and Ashiya's school begins, and the two are assigned to promoting their class' cafe. They run into Zenko, who has lost track of Yahiko. After catching the mischievous Yahiko, Abeno agrees to play with him. When he casually asks Yahiko about Sakae, Abeno gains new information from him--

The Mononokean's job is to exorcise yokai living in the mundane world and send them back to the Underworld where they belong. Master of the Mononokean Abeno Haruitsuki, his employee Ashiya Hanae, and Fuzzy the yokai travel to the Underworld to perform a job for Abeno's boss, the Legislator. Together they help the Legislator with his work, but when Ashiya makes a mistake, he ends up delivering a document to the Executive, one of the top three individuals who govern the Underworld with the Legislator. Who is the Executive--?

England has devised an industrial design that only machines can make. Meanwhile, America becomes the world's number one industrial power.

England has realized that design is important for industrial products. Thinking that Italy has a lot of good artwork, he asks Italy to give him lessons.

Russia is a little behind on the Industrial Revolution and has been pushed around by his bosses, who change very often. He asks Latvia to do something in order to develop Russia's industry.

Unable to follow Italy's Industrial Revolution, Romano goes to America. Meanwhile, England asks around about how he can improve his industrial products.

The time is the eighteenth century. The Industrial Revolution has started with England's small revelation and the move towards efficiency.

After discussing the hyphen issue, Czech and Slovakia decide to live separately. But living alone makes them miss each other.

Czech and Slovakia have finally become independent. Should it be "Czechoslovakia" or "Czecho-Slovakia"? Thus began the Hyphen War.

What do we do if extraterrestrials approach Earth? America's suggestion causes a commotion at the World Conference. Meanwhile, China attempts panda diplomacy with Japan.

Let's check on how everyone is spending New Year's. Japan also learns how to make Stollen from Germany before Christmas.

Merry Christmas! Italy, Germany, and Japan take a look at how others spend Christmas. Italy visits Germany on December 31st.

Belgium and Luxembourg tend to be at the mercy of others, so they pledge to become strong. Meanwhile, Belgium is curious about a certain dog that tourists often ask about.

Japan wants to learn about unusual festivals. Germany is feeling under the weather, so Italy tries to help him get better.

Hungary and Czech are both spa countries. They ask a third party which of them has better spas. Meanwhile, at the World Conference, Spain explains how olives are important.

After moving to America, Romano talks to Spain about his worries. Then, Spain is visited by Portugal. And the Industrial Revolution arc concludes!