User blog comment:TheBlueSlug/Ending/@comment-23853100-20130930120359/@comment-1359322-20131208075619

Shaman King is merely about the tournament between shamans to crown a Shaman King, the author never said that Yoh would become the Shaman King. In High School DxD, Issei has already formed his own harem, he just doesn't realized this. Lastly, Shaman King and High School DxD are completely different series.