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.
and humanity lost in the Great War 
of the Five Races, then...
والبشريّة قد خسرت في الحرب العظيمة
بين الأعراق الخمسة،
den großen Rassenkrieg verloren haben …
y la humanidad perdió la guerra…
y la humanidad perdió la guerra…
si les humains ont perdu
la Grande guerre…
e l'umanità ha perso la guerra, allora...
e a humanidade perdeu na Grande
Guerra das Cinco Raças, então...
Если люди проиграли войну…