In the years following a vicious war the Empire of Zol now controls the land and citizens of rival Aquafa-except for Aquafa's Fire Horse Territory where wild dogs that once carried the deadly Black Wolf Fever continue to roam free. When a pack of dogs race through a Zol-controlled mine Van an enslaved former soldier and a young girl named Yuna are both bitten but manage to escape as the sole survivors of the attack. Finally free Van and Yuna seek out a simple peaceful existence in the countryside. But as the deadly disease once again runs rampant they find themselves at the crossroads of a struggle much larger than any one nation.