Lord Gegenhuber Griesela (グリーセラ卿ゲーゲンヒューバー Guri-sera kyou ge-genhyu-ba-?) is Gwendal's cousin from his father's side. Years ago, Hube's bigotry and ambition led to many deaths forcing Gwendal to banish Hube from the Demon Kingdom under the guise of searching for a lost artifact, the Great Demon Flute. Twenty years later, Yuri learns of Hube in Conansia Svelera (Suberera) from the human woman, Nicola, who is bearing Hube's child. Yuri struggles to learn details about Hube's past but no one wants to talk about the acts that were so terrible, even Conrad is content to watch him die.[43] Hube becomes the bodyguard for a corrupt lord who swindles people into gambling and taking their shop deeds. When Yuri eventually discovers the truth, he forgave Hube for unintentionally trying to kill him, and begs Gwendel not to kill Hube. Gwendal eventually agrees not to, and Hube leaves for his own castle, but not before he tells Gwendal about a box he saw in Suberera.[21] The incident left Hube without his left eye, indicating this box was one of the Four Forbidden Boxes. In the anime, Hube swore loyalty to Yuri because Yuri chose spare his life despite Hube's crime. As such, Hube would go to extreme lengths to protect Yuri, such as leaving Nicola to fight against the possessed Original King.  Source: Wikipedia

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.
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(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!
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(Source: Viz Media)