The Earth Alliance fights against the Lunar Empire of Giganos with the help of an elite trio of super robots.

In the year 2087, the Lunar Empire of Giganos has taken over the Moon, and seeks to conquer the Earth. The Lunar Empire uses giant robotic mechs to achieve a superior advantage over the Earth Alliance... until one day when three special Giganos mechs, the Dragonars, are lost in space and land on a neutral space colony. Three of the residents - Ken Wakaba, Tapp Oceano and Light Newman - come across the suits and become their pilots, taking the fight to the Giganos to protect the Earth. But as the first ever humans to wield such advanced technology, do they have a chance?—Tenchi