Akira Kamui, Ai Kamui and their father have a serious problem: debt! Akira and Ai steal a family heirloom treasure map to keep the spoils for themselves, but an unfortunate distraction occurs: their city, Chitose, becomes the battleground for the military and an invading race of aliens! Falling into the lair of the treasure itself, the giant mecha Tri-Zenon, Akira, Ai and their friend Kanna now find themselves in the adventure of a lifetime: protecting Earth from the powers of Zenon Palace!
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