is a series of Japanese light novels written by Tomo Takabayashi and illustrated by Temari Matsumoto. The story follows the adventures of Yuri Shibuya, an average 15-year-old Japanese high school student, who is suddenly transported to another world where he is told that he is now the king of demons. Yuri becomes the king of a nation where all of the citizens are demons, but they appear indistinguishable from humans. Their only distinguishing traits are their long lives and the ability to use magic. The people of the Demon Tribe are able to make a pact with an element after which they can then use magic of that element. Covenant Castle is in the capital of the Demon Kingdom. It is the residence of the demon king. The culture of The Great Demon Kingdom is very different from the Japanese culture Yuri is accustomed to, and the differences make for amusing mishaps with long-ranging consequences, such as an accidental proposal of marriage. The series was adapted into an anime in 2004 by NHK and a manga in 2005 serialized in Asuka magazine. The manga was updated for release by VIZ Media and launched in North America on September 30, 2014. Plot While on his way home from school, Yuri Shibuya sees his classmate, Ken Murata, being harassed by bullies. When Yuri intervenes, Murata runs away, and Yuri becomes their new target. They force him into the girls' bathroom and shove his face into a toilet, where a portal suddenly appears. Yuri is sucked in and is rendered unconscious. He wakes up to discover himself in a strange world where no one speaks Japanese. Yuri comes to find out that he is of lineage and is the of this world, . He is taken to the capital by Günter and Conrad. When he arrives at the castle, he meets Wolfram and Gwendal, who find it hard to believe that Yuri is their new king. At dinner the next day, Yuri slaps Wolfram after the latter insults Yuri's mother for being human. Unknown to Yuri, among the nobles in the Demon Kingdom, a slap on the cheek is considered a marriage proposal. Wolfram is insulted and immediately challenges him to a duel by throwing his knife on the floor. Yuri, again being unfamiliar with the kingdom's customs, picks up the knife, unknowingly accepting the duel. After Yuri wins by using magical powers