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!

The World Conference is where countries gather and discuss how to resolve issues around the world. However, Italy is late once again. All the familiar faces show up and start off a new round of slapstick comedy!

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.