Like many other Vietnamese refugees, Vio and Bluebell. together with their father, try to reach their mother illegally via the Czech Republic. When they are stopped in the Czech Republic by the Vietnamese crystal meth mafia, they lose their father to the "wolf men" while fleeing from them. So they have to fight their way through the border forest all alone, packed with stolen "crystals" as payment for the smugglers.
When they meet the smuggler Hung, it seems that they have finally found their only ally who will accompany them on the journey to "Excalibur City".