Yuri, a new Demon King in the alternate world, sets to search for Morgif, a legendary sword which only Demon King can touch. Yuri and his search team arrive on Van Da Via Island, and they learn about a strange incident that occurred at the mountain summit's spring some 15 to 16 years ago. They are convinced that the incident was caused by the demon sword, Morugif.

Exhausted from his training to become the next King, Yuri is looking for any distraction he can find. Celi, meanwhile, unexpectedly announces that she is getting married. Later, Yuri devises a plan to stop Wolfram from trespassing into the King's room... sounds easy enough, but it requires some monster slaying!

After witnessing the widespread destruction that the "End of the Earth" caused, Yuri decides to destroy Conrad's arm, which has turned into a key that opens the "End of the Earth." After learning that the world's best fighting event is actually fixed, Yuri and his group set off to participate, against Gunter's objections.

Yuri Shibuya just can't catch a break. First, his head is dunked in a toilet. Then he's transported to another world - where he finds himself king of the Mazoku's, a new race that expects him to lead them to war against all of humanity. And to top it all off, he's engaged - to a man!

On the way to the border village with Wolfram, Yuri and the others run into Adalbert, who tries to convince Yuri to join the human side. But it turns out that Adalbert has led the humans to the village to start a disturbance! Will this finally convince Yuri to become Maoh and put a stop to all this fighting?

In disguise on a luxury ship, Yuri, Conrad, and Wolfram continue their voyage to Van de Veer island in search of the royal sword Morgif. But when pirates board the ship and raise Yuri's ire, can he keep from blowing his cover along with his top? And the sword of a demon king is going to have some nasty surprises of its own for our young hero!

A king's job is never done! The quest to fully activate Morgif isn't over. As hard as Yuri tries to feed his strange sword human energy without taking unnecessary life, the duties of a King sometimes require unpleasant sacrifices. Can Yuri reconcile his true feelings with his new job?

Yuri and the three brothers set out to rescue Yuri's impostor, who is supposedly in the country of Svelera. Along the way, Yuri and Gwendal are separated from the rest, only to be arrested for being elopers! Have they been lured into a trap? Only an abandoned bride and the true imposter will tell!

Yuri Shibuya is an average baseball-loving high school student. One day, Yuri tries to save his former classmate from a group of hoodlums. Turning on him, they drag Yuri into the bathroom and push his face into the toilet. When they flush the toilet, he is transported to another world! Yuri is then taken to a castle and crowned King of the Demon World. Is he going to end up as the leader of the land, surrounded by his extraordinarily handsome lieges, or will he make it back home?

Yuri Shibuya is an average baseball-loving high school student. One day, Yuri tries to save his former classmate from a group of hoodlums. Turning on him, they drag Yuri into the bathroom and push his face into the toilet. When they flush the toilet, he is transported to another world! Yuri is then taken to a castle and crowned King of the Demon World. Is he going to end up as the leader of the land, surrounded by his extraordinarily handsome lieges, or will he make it back home?

Soon after locating "Hells Fire on Frozen Tundra," one of the Four Forbidden Boxes, in Francia, Yuri and his team are captured by Big Cimaron's army - lead by none other than Conrad! Yuri is deeply hurt by this betrayal, and to make matters worse, King Belar of the Big Cimaron suddenly shows up, ordering Conrad to execute Yuri!