Natural disasters have devastated planet Zi, wiping out nearly all life. A millennium later, humans have slowly rebuilt civilization, recovering ancient Zoids through diving and mining operations. In a village that reveres a giant sword as a holy relic—their oldest known artifact—a teenage boy uncovers an ancient Liger-type Zoid during a deep-water salvage mission. Suddenly, the village is attacked by skeletal Bio-Zoids intent on stealing a powerful generator located there. Our teenage hero awakens the Liger and realizes that the town's sacred sword is actually the Liger's weapon; together, they fend off the mysterious Bio-Zoids. At least for now...