In the year 20XX, humanity confronts an unprecedented crisis in its history as extraterrestrial dragons choose Earth as their breeding ground. Unfortunately, when the dragon eggs hatch, they absorb all nutrients from the surrounding land, reducing it to a barren wasteland. This is what happened to Tokyo two years ago, where our hero, Kamishina Jin, lost his loved ones. Now, he has joined the Dragonaut units alongside Toa, a mysterious girl who saved him, to stop the dragons from destroying the rest of Earth.