Battle Royale High School

"And you Though Your High School was Tough?!?"

When the school Karate club's star fighter quits and decides to go pro, he unwittingly fulfills an ancient interdimensional prophecy and becomes demon king of his dimension. Soon his high school becomes a battleground for demon slaying samurai, interplanetary law enforcement, and even his own traitorous demon minions. Well animated fight scenes ensue.