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In the 21st century, Earth has returned to its former peace, but a meteorite falls from the universe, containing an artificial time capsule. The GUTS team of the Earth Peace Union (TPC) learns through the time capsule that a great disaster will befall Earth. At this time, the two monsters predicted by the time capsule, "Gulza" and "Mireba," appear one after the other. The GUTS team then sets out to search for the bodies of the three giants hidden in the pyramids, as foretold in the prophecy. After much searching, the GUTS team finally finds the pyramids, but the two monsters also arrive. Despite the GUTS team's desperate defense, two of the three statues have been destroyed, and one of the team members, Daio's fighter jet is hit, and the escape device malfunctions. In a critical moment, Daio suddenly transforms into light and merges with the last statue. The light giant "Diga" is thus revived and engages in battle with the two monsters...