S1, E1: 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.

S1, E1: 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.