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.
Right now, the other four races 
are ruling the world
حالياً، الأعراق الأربعة الأخرى يحكمون العالم
Die Welt untersteht der Herrschaft
der anderen vier Rassen,
Las otras cuatro razas dominan el mundo
Las otras cuatro razas dominan el mundo
Les quatre races
dominent les continents
Al momento, sono le altre quattro razze
a dominare il mondo,
No momento, as outras quatro
raças estão dominando o mundo
Сейчас миром правят другие расы
ตอนนี้โลกถูกครอบงำโดยทั้งสี่เผ่าพันธุ์