Big Shimaron has taken control of Francia making escape hard for Yuri and the others.

Francia has made Conrad a prisoner and decided to join in alliance with the Demon Kingdom.

Yuri's older brother Shori reminisces about a time in Yuri's youth when he would call him his "big brother."

Baby Ernst, Eru for short, the son of Hube, and several other noble born children are gathered at Covenant Castle for the "Great Birth Ceremony."

A mysterious girl who bears a strong resemblance to Ulrike is seen being mischievous around town.

Stoffel has plans to set up Yuri with an appropriate princess thereby cementing his ties with the current ruler of the kingdom.

Yuri and co. have gone through lots of boxes in order to find the last box but coming up empty. They learn of a box in a lake and go to investigate.

Dunheely, Conrad's father, has trouble getting along with Gwendal especially when Gwendal despises him. When Dunheely has Gwendal join him in helping a secluded town of outcasts Gwendal must learn to see his step-father as the person he truly is.

After having their box stolen by the Maou, Big Shimaron finds a new way to impose power over the allied countries: an "overseas study exchange".

Adalbert has taken King Yuri hostage and demands to know if Yuri does in fact have Julia's soul.

Panic consumes the troops of both nations and Big Shimaron's king decides to leave the children he already has in order to escape the volcano's fury.

Maxine still has not given up hope of returning to his country and becoming wealthy and powerful. When he kidnaps Yuri and tries to escape he runs into one of Yuri's devoted subjects and is forced to abandon his plan.

When Yuri stumbles upon the "Demon Mirror" he's transported back to the time when Lady Celi ruled with the help of Stoffel. Yuri winds up meeting Lady Julia and comes to understand why she was loved by so many people.

Günter sets off on a "Nation Wide Tour" in order to better understand the "Common People." He comes to a town modeled after the old west and discovers that the town is full of fear and that only one person holding it together is a girl by the name of Gloria.

A man cloaked in shadows shows up wielding the power of the holy sword.

Yuri and the others go to check out the rumors about the Holy Sword and stumble upon a man possessed with demonic energy who wields the Holy Sword. Alford shows up in search of his sword and winds up helping Yuri and the others retrieve it.

A mysterious masked man with hypnotizing powers walks into King Belar's castle unhindered leaving us with many questions yet to be answered. Back in the Demon Kingdom Yuri is holding a party for the Alliance members.

Yuri is captured along with Wolfram and taken to Big Cimarion in order to be handed over to a hypnotized King Belar. Their transport is attacked by bandits who are led by a familiar face.

Yuri decides to confront King Belar and try to convince him to stop fighting. He goes off with his crew and Adalbert in tow towards the King's Castle.

Ulrike reveals that the final forbidden box is on Earth. Yuri, along with Murata, Wolfram, Conrad and Gwendal set off to locate and bring the box back to The Demon Kingdom.

Yuri takes the group on a sightseeing trip while waiting for Bob, the Maou of the Earth to contact them. Shori meets up with Rodriguez, who ask a favour from him.

Yuri and co. travel to Switzerland after discovering that Bob is currently staying there. Yuri is shocked when he finds his parents followed him there and they travel together to meet Bob on a bus that was sent to fetch them.

Yuri and Bob battle with magic and Yuri wins. Bob decides to entrust the final forbidden box to Yuri.

The Kohi and many animals are acting up due to the fear of all of the forbidden box's are gathered together. Yuri manages to gain their trust and calms them.

Günter is poisoned again and Suzanna Julia's retired father visits the Demon Kingdom to release him and him and Yuri talk of Julia. But then, Günter's body unexpectedly moves on its own.

It seems that one of the maids has been affected by miasma, a disease that makes the person unable to trust anyone. Yuri, Wolfram, Jozak and Conrad must obtain a rare herb on a mountain to cure the maid but how will they succeed if they are affected by it too?

Yuri along with Conrad, Murata, and Wolfram travel back to earth in order to get something Yuri left behind. They are unable to return to their world because of the box removed from Earth and they travel to Switzerland where Bob is to ask for assistance.

Human villagers decide to build a bridge between the land of humans and the Mazoku. But they are being attacked by mysterious light wolves believed to be the ghosts of the war 20 years ago.

Günter teaches Yuri about the past of The Great Demon Kingdom. The founding king Shinou, the Great Sage as well as the four families with the keys to the boxes are shown. Afterwards, Wolfram seems to be acting strangely.

Shori goes to The Great Demon Kingdom by accident after the lake in Switzerland pulls him in. He asks Yuri to stop the ceremony of the forbidden boxes and questions the Original King's decisions.

Shori can now manipulate water and practices. Miko attempts to go to her sons in scuba diving equipment and ends up dragging her husband into freediving. While practicing, Shori loses some control.

Yuri forgives Shori for his misdeed and consoles him by telling his admiration for him to use maryoku and recover so quickly.

Yuri starts the ceremony but Wolfram suddenly attacks Yuri, distracting Yuri into messing up the ceremony. A dark figure appears and takes Conrad's left arm.

Shinou praises his handpicked strategist and Wolfram is taken to Blood Pledge and Greta wonders if he had died. Anissina speculates that Wolfram still is alive and plans to freeze his body like Günter's when he was poisoned.

Yuri and co. head back to The Original King's Temple to retrieve the keys from The Original King. However, they are attacked by Soushu's army of dolls when they enter.

Soushu enters Yuri's body to take it over from the inside. Conrad, Gwendal, Jozak, Hube and Günter awaken outside the temple and return to the castle, where Wolfram had been revived with his heartbeat returned to him.

Soushu has successfully taken over Yuri's heart by revealing why he chose him as the Maou—to be his body. Meanwhile, Günter and Dorcacos travel to Morgif's birthplace in order for him to reveal his true powers.

Soushu is forced out of Yuri's heart and Yuri defeats him, causing Soushu's troops to disappear as well as Shinou's soul together with him who thanks him. Murata told Yuri that they can not travel again to the other world because Shinou had disappeared.