Murata is Yuuri's former classmate. He often gets into trouble such as having delinquents picking up a fight with him. He's actually a happy-go-lucky type of guy that sometimes hit on girls, bleached his hair, getting over-friendly with Yuuri's mom, and he often stumbles upon Yuuri's house just to eat her curry.   ~!In the first season, after the incident with the time and space being unstable, Murata accidentally (or maybe purposefully?) drops by into the other world with Yuuri. He's already suspicious since the beginning because he easily speaks the same language as the villagers. He's even more suspicious when he spoke to Yozak like he knows everything going on and planning the best possible way. Soon after that, it's finally revealed that Murata is actually the reincarnation of the once Great Sage (or Daikenja) of Shin Makoku 4000 years ago.  His place was to guide Yuuri as King to regain the four forbidden boxes and defeat Soushu (which that time remained in Shinou's soul). In the end, he succeeded and Yuuri managed to did it, even though in order to make that plan successfully work, Murata had to 'pretend' to betray Yuuri and the others.  Murata is more like a babysitter figure towards Shinou, because of the time they had spent together in the past, and him being Shinou's most trusted strategist. Even so, he truly respects Shinou as a leader and even when he (Daikenja, 4000 years ago)'s dead and reincarnated into a different person, all he thinks about is how to defeat Soushu.  As the Great Sage, he is really bright and wise. He acts calm and never rushes to do anything. He relies on his brain and strategies. His power cannot stand alone, but he can amplify the Maou's power, and has lent Yuuri his powers when he needed it.  Murata is a really mysterious person, he usually hides his pain and past just to himself.!~

Yuri Shibuya was living a pretty normal life. That changed the day he was dunked into a toilet after an attempt to save a classmate from a gang of bullies. Instead of just getting a good soaking, he's pulled in. The next thing he knows, he's in a world that vaguely resembles medieval Europe. If that's not odd enough, he's told that he is to be the next Maoh, just because he has black hair and black eyes. The Maoh is the King of the Mazoku, who are coexisting not-so-peacefully with the humans in this world. Much to his subjects' dismay, he's totally different from the rulers they're accustomed to. He's kind, considerate, a believer in justice, and not willing to use violence to solve conflicts. Not exactly someone they want running a country on the very brink of war. Now, Yuri has to deal with trying to become a good Maoh, while at the same time attempting to adapt to this lands' customs and culture, all in a world where the tension between the humans and Mazoku is reaching its peak.
 
(Source: Anime News Network)

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Kouki Miyata is a Japanese voice actor who works for 81 Produce. He was formerly credited as Harunori Miyata (宮田始典, Miyata Harunori). He made his radio CM narration debut on 2 March 1993. He is also the Japanese dub voice of ''Phineas'' in the series ''Phineas and Ferb''

At the end of season 2. Yuuri defeats Shinou, but since Shinou had been defeated, Yuuri and Murata could no longer go to the Shin Makoku. However, because Yuuri had fought and defeated him, his powers had surpassed that of Shinou's, resulting in him being able to rely on his own power to return to Shin Makoku. 
After the ceremony at the age of 16, Yuuri slowly begins to discover that much has happened while he was away. The ten officials of the noble family have decided to make Wolfram the next Maou, but now that Yuuri has returned and taken back his role as Maou, complications arise when one noble disagrees with Yuuri returning to the throne. 
In addition, an ancient secret society that threatens the peace of both humans and Mazoku has risen, and a fight for the throne that now leaves the nobles wondering who is the legitimate Maou.

Life has returned to some form of normalcy after the end of the series, and so His Majesty Yuuri Shibuya travels to oversee how things are going. While doing so, he runs into the king of Small Shimeron--Sararegi. But it seems there may be something more to him than the friendly king he presents himself as. Yuuri go back to Shimaron to relax and meet some friends, when the "king" of Little Shimaron suddenly joins the group and wants the Maou to come to his country. The Original king sends a message to Yuuri's brother and his friend that Yuuri is in trouble.
 
(Source: Anime News Network)

Yuri Shibuya just can't catch a break. First, he had his head dunked in a toilet. Then he was 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!
 
(Source: Viz Media)

Ken Murata