Descended from dragons, the Ryudo brothers harbor an age-old mystery. With every passing day, they grow stronger, equipped with the speed, power, and might of their fabled forefathers. Yet, when faced with their limits, they transform into the formidable, uncontrollable dragons from tales of old. Their prowess has captured the interest of potent adversaries: shadowy groups, armed with endless resources, who will go to any lengths to dominate the brothers.