If there's one word to describe Reiji Ozora, it would be "quitter." He can never find the motivation to finish anything, and loses interest at the drop of a hat. This all changes when his best friend Maiko introduces him to the new game "Dragon Drive." In this virtual reality game, each player is assigned a dragon tailored to match their personality and strength. Reiji hopes for a big, strong, scary beast, but instead, he is stuck with Chibi, a cute, friendly-looking dragon smaller than he is. How disappointing—except it turns out that Chibi is the rarest dragon of them all! Reiji finally discovers something he can remain interested in, and works hard to train both himself and his newfound friend. Soon this training will be put to use to save the world, for there are people who have dark aspirations for Dragon Drive!

In the far reaches of the dark and frozen universe, nine enormous dragon corpses were tied with an ancient bronze coffin. It seems that they were set there since the birth of the universe. Such an astonishing scene was captured by a space probe floating in outer space. Nine dragons and the mysterious bronze coffin made people wonder whether they came back to ancient times or just reached the other shore of the universe. A giant mythical world was unfolded, where immortality gradually appeared and paranormal events continuously occurred. Countless people started to find their own tracks (The Dao) in such a mythical realm. Their passion was like a turbulent ocean wave that would never cease. The heat in their blood was like erupting volcanoes. Their desire for power and immortality dragged them down to the chasm without knowing it. Thirty-three classmates held a reunion after graduating. Their friendship was tested, as the bronze coffin took them away from earth and arrived on another unknown planet. The desire for living forced them to follow the path of the ancient gods. Entering a new world of cultivation, will any of them reach immortality, or will they all die along the way?

Renton, son of scientists, and Eureka, a girl who can't live under the sun, are raised together when very young and become very attached to each other. One day, Eureka is taken away. Powerless at the time, Renton vows to rescue her. He enters the military and is soon is assigned to the Independent Youths Unit 303 of the First Mobile Forces thanks to his exceptional performance alongside his Nirvash, a bio-mechanical armor/control system. Unknown to Renton, lies a plot to extinguish the alien invasion that is currently happening involving not only him, but Eureka too.