Yuri Shibuya is flushed down a toilet into an alternate world where he meets new people and discovers important information about himself.

Yuuri attends a dinner party and meets more of the people who will make up his subjects. He accidentally challenges Conrart's brother, Wolfram, to a duel.

Yuri and Wolfram sneak off to participate in a skirmish in a human village without anyone knowing.

We receive flashbacks of Yuri's parents and his birth. Yuri returns to Shin Makoku and faces a tough decision concerning war.

Yuri sets out on a ship with Conrad and Wolfram to obtain the legendary sword Morgif to aid him in preventing war with the humans.

Yuri, Conrad, Wolfram, and Josak arrive on the island and begin searching for Morgif, the powerful demon-sword that feeds off of human lives.

With Morgif now in his possession, Yuri finds out that the sword needs to absorb souls for energy. Jozak tricks Yuri into participating in a gladiator event so he can absorb souls when people die. Yuri is forced into a colosseum fight to the death and when he reaches the field he finds out that his opponent is Rick, the apprentice from the ship they were on. Yuri wins the battle and attempts to spare Rick's life but since Yuri won't kill him Rick is shot with an arrow by one of the guards.

While Yuri is on Earth, Stoffel is in the other world hatching a plan. Yuri returns to the other world once again after a baseball game, arriving in the Original King temple's fountain. There he is met by his advisers, and the temple Maiden, Ulrike. Ulrike warns Conrad of impending danger. At night, Conrad and his soldiers go to investigate some incidents of villagers being attacked. During the investigation, shadowy figures infiltrate the castle.

In the morning, nothing appears to have happened. However one of the soldiers found the door to the treasure room was picked. They find that the gem of the dragon king, which was part of a crown, was stolen. Yuri attempts to find the gem which leads to some comical events. During the search, the shadowy figures reveal themselves and try to kidnap Yuri.

As Yuri, Wolfram, and Conrad leave the castle to some soldiers, Stoffel and Raven start their next move. During the investigation, Conrad orders Wolfram and Yuri to stay put in a building. Yuri drags Wolfram and the remaining soldiers to conduct his own investigation of the missing dragon gem. Yuri's action led to his own abduction by Stoffel's men. Now Conrad and Wolfram head to Stoffel's castle to rescue Yuri.

Yuri wakes to find himself in Stoffel's castle. Stoffel tries to persuade Yuri to join his side, but Yuri rejects. As Gwendal and Stoffel prepare their soldiers for war, Jozak, dressed as a maid, manages to sneak Yuri out of his room by dressing him as a maid as well. Yuri gives their position away when he hears that a civil war is about to start. After Yuri reunites with Conrad and Wolfram, Yuri proceeds to stop Gwendal and Stoffel's forces from engaging.

Yuri goes to see a dolphin show, but when he is called up to the stage to shake hands with a dolphin he is then transported to the other world. After Yuri finds out about an imposter thought to be the Demon King, Yuri plans a trip to save the person, accompanied by Wolfram and Conrad. Along the way, they met up with Gwendal. During the trip, they encounter a Sand Bear and Wolfram along with the rest of the soldiers except for Conrad and Gwendal fall into its sand trap.

Gwendal and Yuri enter the capital city of Svelera. When they enter a church they met Nicola, a bride, who then runs away from her own wedding ceremony with Yuri and Gwendal (both still chained together). A young boy gives refuge to Yuri, Nicola, and Gwendal from their pursuers. As they hide from their pursuers, Nicola reveals that she has the demon flute. Yuri tries to use it but does not work. Their pursuers found their hiding place and so the boy and Nicola escape through the secret tunnel...

Gwendal and Yuri are sent to trial for Yuri eloping with a demon. Yuri is sentenced to work in the esoteric stone mines, while Gwendal is confined in a cell lined with esoteric stones. Conrad and Wolfram find the boy and Nicola who inform them of Yuri and Gwendal's possible locations. While Yuri was working at the mine, he sees some soldiers attempting to bury a beaten and bruised, but still alive baby.

After Yuri wakes up, he finds Norica digging through the cemetery looking for her son. Instead of a body, they find the second part of the demon flute. As Yuri, the remaining women, and the brothers traverse the desert to escape the forces, they are trapped by the Sand Bear and prison guards. Yuri plays the Demon Flute which summons a storm that stops the prison guard army. Ryan then assists their escape with his partner, the sand bear.

After Yuri studies and practices baseball with Conrad, the news of a demon stone being stolen perks Yuri's interest. Yuri sets off into the city to find the stone with Jozak, Conrad, and Wolfram. They find the missing Demon Stone in the hands of Rosetta and her family, but the family is using the stone's power to repair magic tools and restore magic to earn more money for food. Yuri then decides to help them to get enough food. While they were helping Rosetta, they found that some thieves...

Stoffel and Raven attempt to appease Yuri by arraigning a celebration for him. Celi bursts into the room and declares she is marrying Raven, which shocks Raven and Stoffel. The past of Stoffel, Raven, and Celi is also revealed. During the ceremony, Ryan along with the sand bear, Keiji, arrive. Keiji's entrance however causes a sinkhole that Stoffel, Raven, Celi, Yuri, Gwendal, and Conrad fall into. Raven and Celi reminisce their childhood memories at a crystal cave. Stoffel, Yuri, Gwendal, ...

Yuri and Wolfram enter the guesthouse to get rid of some monsters. They both fall to the basement of the building due to weak floors. There they meet some caterpillar creatures that soon transform into their cocoon stage. Wolfram and Yuri have an argument about killing the monsters or letting them live. Meanwhile Gwendal and Günter search for Wolfram and Yuri. The building was collapsing, but then the cocoons hatch into bear bees and they keep the building from collapsing.

A fantasy world calls for a fantasy adventure, and Yuri has decided that he wants to see a dragon. He, Wolfram, Conrad, and Günter set out to the dragon preserve (dragons are an endangered species after all) to find one. Yuri quickly makes friends with one, just in time for some trespassing humans to attack looking to kill and sell a dragon. Unfortunately for Yuri, the group includes a young hero named Alford with a holy sword who decides to use the confusion to try and kill the "evil demon kin

Alford learns what it truly means to be a Hero. Yuri and the others find the dragons a new nest to help shield them from possible future poachers.

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. He asks Shori to persuade Conrad and the others to return to their own world. After seeing Shori's failed attempts, Rodriguez attacks Conrad with magic and tries to force him back to the other world. Why is Rodriguez doing this? And is he doing this on his own or following the orders of someone else?

A young girl shows up claiming to be Yuri's illegitimate child, and then tries to kill Yuri. Yuri, compassionate as always, decides to give the girl the benefit of the doubt and assures everyone that there must have been a good reason behind it. To recover from a twisted ankle he received during the assassination attempt, Yuri along with Conrad, Wolfram, and the little girl head to Hildyard to visit some healing hot springs. The city looks fun, but who is the mysterious, masked bodyguard and why

Greta spotted a man in town that she wanted to see again. Despite the fact that Conrad had told them to stay put, and still suffering from a twisted ankle, Yuri takes Greta into town. Yuri gets a sense of Déjà vu when he stops to defend a girl from some bullies and she promptly runs away. Yuri grabs Greta and runs and the same girl that ran saves them. However, they are eventually caught. They get away from the cell, but while being chased they are saved by Conrad and Wolfram.

The masked man turns out to be Hube, who now lays dying with Greta clinging to him. She tells the others that in her old home, Hube, who was in the dungeon, was the only one who would talk or listen to her. Yuri wants to heal him but Conrad tells him not to. Wolfram does only because it's what Yuri wants. The next day Yuri and the others go to a rare animal race. It turns out that after the fight between Conrad and Hube that Yuri demanded that Vuillon return everything he swindled from the...

Hube is returned to the Demon Kingdom and it seems that no one likes him. Greta tells Yuri that Hube had once told her that he'd done something unforgivable. But what? Then they hear that it has something to do with a woman named Julia. But who was she? Yuri learns through Gisela what exactly happened to Julia and why everyone blamed Hube.

Hube once again attacks Yuri and Conrad defends him. Gwendal decides that Hube must die for his crimes. Both Greta and Nicola do their best to try to help Hube. But will their help be enough? Will Hube be killed or will he live to see his child born? After Nicola's baby boy is born Yuri decides to adopt Greta. Yuuri is finally able to return home.

Conrad thinks about how life seems to continue on, though more slowly when Yuri is not around. He recalls a tragedy at the end of the war 20 years ago and remembers the time he went to Earth to deliver the Maou's soul to a certain mother-to-be.

Yuri is suddenly pulled back to the other world but instead of ending up in a water source as usual he ends up in a barrel of alcohol. Günter and Conrad soon arrive with Greta in tow. It seems there's unrest with the humans wanting to start a war and that Conrad and the others did not summon Yuri this time. If anything they are more desperate to send him back to Earth! Greta was riding with Conrad and Yuri with Günter when Günter is shot by an arrow!

Yuri soon learns that for the first time he is not alone. Somehow Murata has also ended up in the other world with him. They are told about the owner of a nearby castle and go there. Adalbert and a man named Maxine also show up. Yuri hoped that Adalbert would not recognize him with a hat and sunglasses on but he does. When the country's guards appear Adalbert and Maxine run but then Yuri realizes that the weapons are the same as the ones from the battle Conrad was in.

Yuri, Murata and Lady Flynn are on a ship carrying cargo, passengers and prisoners. They're heading towards Big Shimaron when it is attacked by Small Shimaron. Lady Flynn not wanting to lose Yuri, grabs him and they go overboard. Murata goes in after them, not wanting to be left alone. Jozak, in disguise, then releases all the sheep and prisoners. The sheep can become big flotation devices. But now that they're on land, are they really safe?

Yuri learns of the Four Forbidden boxes that will bring destruction. Murata seems to know a lot more about this world than he should, raising questions as to his true identity. Murata and Jozak devise a plan to rescue Yuri and escape. However, in the end, when Murata's life is in danger, Yuri refuses to run away and leave anyone behind again.

It seems Murata may be someone of importance. We learn that Conrad's arm may be the key to releasing the power of the box. Yet, if it's not the right key, then the box will become out of control. If the box gets out of control, does Yuri have what it takes to stop it?

Ken Murata is something more than simply Yuri's friend; he also holds a high place in the Demon society. Thanks to Jozak, Gwendal comes to Caloria bringing with him aid for the wounded and homeless. Despite not wanting help from the Demons, the citizens of Caloria grudgingly accept their help after some persuasive talks. Finally, a messenger arrives from Big Shimaron informing the populace that the Ultimate Tournament is about to begin.

Every four years the Ultimate Tournament is held and Yuri enters on Caloria's behalf. In order to qualify for the tournament he must win the preliminary race from East Nilson to Lambeil. Yuri races to become the winner of the preliminary but as he soon finds out many challenges await him including Maxine with his vengeful manju attack!

The Ultimate tournament begins with Wolfram taking the first fighting position. After his battle Jozak battles with Adalbert who has entered this tournament solely for a chance to fight with Yuri. The group runs into trouble when Lady Flynn is captured and held as ransom for them forfeit the tournament. What can Yuri do to help Lady Flynn and who is the masked lady that claims to protect love?

Yuri is about to begin his battle, fortunately, Lady Flynn is safe and he can fight the next opponent with all his might. But as he soon finds out his battle will become very complicated when someone he trusts is fighting on the opponent's side. And when Adalbert joins the battle Yuri winds up fighting for his life!

King Belar declares that Big Shimaron is the winner of this year's Ultimate Tournament and orders Caloria's representatives to be arrested. This leads Yuri and the others to make an escape with the help of Fanbalen, Lady Celi's current love interest. With Fanbalen's help they are able to escape with the box The End of the Wind in tow. Conrad is not with them and it looks as if he will not return to the Demon Kingdom.

The episode starts with Conrad's dream, where someone appears to him an arm. Yuri is back on Earth depressed thinking about Conrad. Then later meets Murata at the park. Yuri tries to get Murata to help him get back to the other world, Murata decides to help Yuri back to the other world. When they reach the other would, Wolfram, Günter, Greta and Ulrike are there to greet them.

Yuri and his group travel to Cavalcade and meet Mr. Heathcrife who can help them get into a secluded land called Francia. The king of Francia refuses to choose either the Demon or the Big Shimaron side. Conrad with his Big Shimaron goons are also in Francia and are also after the box. Will Günter accept Conrad's betrayal or will he be forced to kill him?

Lyla, the king's helper, takes it upon herself to show Yuri and the others around and to help them look for the forbidden box. After many hours of fruitless searching Yuri and the others are told that the box has been found in an old esoteric training ground. However when they arrive at the ruins they find the troops of Big Shimaron waiting to ambush them. Will they escape from this trap and manage to find the forbidden box?