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The adventurous and kind-hearted Van is a 17-year-old boy who lives in a small village on Planet Zi – a world where giant beast-like mecha known as Zoids live alongside humans. One day, while out on his hoverboard, Van is chased by a group of bandits, and ultimately finds himself in the midst of some old ruins. To his surprise, he finds a hidden passage that leads him to pods containing a wild Zoid (which he names Zeke), and an amnesiac girl named Fiona. To protect his new friends from the bandits that lurk around each corner and to help Fiona regain her memory, Van decides to travel alongside them; and thus their adventures begin!
It's mainly about two different armies battling each other out with their mecha.
Perverted, cocky Ken used to live a normal life until several giant monsters crashed onto his city. In the midst of their carnage Ken’s secret crush was killed, and his grandfather seriously injured. Hope seemed lost for the inhabitants of the city and the world, until Ken discovered that he holds the key to summon the pilotable Beast-God Riger! Within the massive bio armor, Ken must now battle the invading monsters to protect Earth, and keep them from awakening a demon within the Demon Stone – a demon who will put a stop to all human life for good!