After a brutal conflict, the Empire of Zol reigns over most of Aquafa, save for the Fire Horse Territory infested with wild dogs carrying the dreaded Black Wolf Fever. Van, a former soldier turned slave, and Yuna, a young girl, survive a dog attack in a Zol-controlled mine, marking them as the only survivors. With newfound freedom, they aim for a tranquil life in the rural expanse. However, the resurgence of the lethal disease thrusts them into a grander conflict transcending national boundaries.