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今日からマ王!
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 and Murata return to The Demon Kingdom. Günter is preparing for the Maou's 16th birthday where Yuri will determine his path as an adult, Wolfram is on his way back from the Bielefelt lands. It turns out that while Yuri was away, the Ten Noble Family had chosen a new Maoh, which turns out to be Wolfram!
Yuri goes through with the ceremony and soon finds himself in The Original King's temple where he has to make the final decision. He meets The Original King himself, who tells Yuri that he will eliminate anyone who dares oppose Yuri being king.
After Yuri's decision is final, Wolfram brakes off the engagement in order to avoid any conflict and returns to the Bielefelt lands. Yuri pursues him and they have a duel. Yuri then uses his powers to defend himself and Wolfram, and to prove he is worthy of being king.
When merchants come to The Demon Kingdom's capital to sell miniature bearbees, the whole town is turned upside down. Greta convinces Yuri and Wolfram to buy her one, but the merchants give her one piece of advice: never get her bearbee soaked in water. They soon discover why.
During one of his study sessions, Yuri receives an invitation to attend Lyla and king Antoine Jean Le Pierre's wedding. However, the king announces that the special sword of his country, the one needed for them to get married, had gone missing. Yuri promises to find the lost sword.
Murata, Jozak and Conrad travel to Big Shimaron to obtain something that Murata had left behind without Yuri's knowledge. Yuri and Wolfram find out and follow them in Celi's ship.
Yuri and Wolfram attends a banquet disguised as girls. It is there where Yuri meets Saralegi for the first time. Yuri was exposed while Wolfram escaped with Adalbert's help.
Murata, Jozak and Conrad infiltrate the castle and manage to find a box full of swords. When an intruder alarm is sounded, Murata discovers it was not them that had been found.
Lanzhil, in order to get rid of both Conrad and Yuri, orders Conrad to execute Yuri to prove his loyalty to Big Shimaron, knowing that he would not do it.
Yuri and co. visits the academy where Conrad trained to become a soldier.
It turns out that Anissina's brother has set her up with a suitor for her to marry.
Yuri, while visiting Caloria, was attacked by members of the White Crow but fortunately was saved by Al while Wolfram and Conrad were busy fighting.
While trying to obtain the swords, Yuri and co. were tricked and attacked by the White Crows.
Yuri, Conrad, Wolfram and Murata returns to Earth so that Yuri is able to take his final exam.
Greta's past is revealed.
An old invention that was created a long time ago is found.
Sara invites Yuri to Small Shimaron to make an alliance with The Great Demon Kingdom. They were attacked while having a discussion.
Yuri and Sara returns to the latter's castle where Yuri meets Sara's trusted subordinate, Gerard.
Sara is captured while Yuri manages to escape with the help of his subjects but Yuri is determined to go back and save Sara.
Big Shimaron has crossed over to Small Shimaron to capture Yuri.
