Kyou kara Maou!

Synopsis

Yuuri awakens to finds himself in the girl's bathroom he originally disappeared from with Ken Murata in front of him with a police officer. Yuuri decides to continue his interests in baseball by starting his own baseball team. While Yuuri is at a baseball game, his mother, Miko, reminiscences about the past. After the game, Yuuri is sucked back to the other world, where he finds out that some humans are threatening to start a war with them. Gunter and Gwendal think it's a good idea for Yuuri to hunt down the demon sword, Morgif, to make them so strong the humans will give up on wars.

(Source: Wikipedia)