Kai's duty as a member of the Human Protection Agency is to ensure that the four races from The Great War are kept sealed in their graveyards. Humanity has been at peace for 100 years, until one day a portal opens and the world he's known ceases to exist.
there are four of these 
graveyards around the world.
هناك أربعة من هذه المقابر حول العالم
hay cuatro cementerios
por todo el mundo.
hay cuatro cementerios
por todo el mundo.
há quatro desses cemitérios
em todo o mundo.
Могильников в мире четыре.