Kyo Kara Maoh! (Kyō Kara Maō!?) is a Japanese series of light novels written by Tomo Takabayashi, which have been adapted into an anime series released domestically by Geneon USA, a manga and a series of audio dramas.

The story follows the adventures of 15-year old Yuri Shibuya as he discovers his future in a world where demons and humans are fighting against one another.

Yuri Shibuya is an average high school student whose passion in life is baseball. That is until he intervenes in the bullying of a classmate, Ken Murata, and gets his head dunked in a toilet. Surprisingly he is sucked into the toilet, and ends up in another world. When he reaches dry land, he sees some people dressed in medieval costume and speaking in some weird vernacular. He assumes that it is a theme park of some sort. However, the people are afraid to see him and begin to pelt him with stones. There he meets Adalbert von Grantz who uses some form of magic so Yuri understands the local language. Conrad Weller and Günter von Kleist then rescue Yuri and take him to Blood Pledge Castle, the residence of the Maoh, where he soon finds out he is the new Maoh or Demon King will rule over ‘Shin Makoku’ ("True Demonic Kingdom").

He also meets up with Wolfram, who he accidentally engages by a mishap.

Throughout the series, Yuri is constantly confronted with the results of even the smallest choices he makes. With a strange power dwelling inside of him, Yuri becomes a deliverer of justice in the world of Shin Makoku.