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THE MONSTER KING ROARS!
A hundred years ago, during a GREAT WAR, Maou, THE MONSTER KING, has been defeated and sealed away by human HEROES. For a hundred years, he was biding his time, and recovering his strengh.
During that time, MONSTERS didn't dissapear from the world, but with MONSTER KING sealed, a person would need to be exceptionaly evil to transform. Places with evil aura can also spawn monsters on it's own! But not often. And with monster population low, the HEROES could always beat them back.
But now THE MONSTER KING stirs in his prison. He releases his power into the world in a terryfying roar! Humans who's heart is black on the inside, the ones harboring EVIL within them, cannot withstand the call of their inner monster, and by the power of MONSTER KING'S ROAR they transform!