Twenty years prior to the story’s starting, an asteroid headed for Earth destroys Pluto. As a consequence of Pluto’s destruction, the asteroid, which is dubbed Thanatos, turns into briefly stagnant. Now, so as to keep away from Earth’s impending destruction, the Worldwide Solarsystem Growth Company (ISDA) works on the “D-Venture”, and creates the “Dragonaut” after discovering a dragon egg underneath the ocean. This weapon’s main goal is to destroy the asteroid when the time comes. Nevertheless, they quickly discover out that the asteroid will not be their solely risk, as highly effective dragon-like creatures, that are bent on destruction, seem on Earth.
After witnessing a homicide by one of many creatures, Jin Kamishina, a lonely 18-year-old boy who misplaced his household in a shuttle accident two years in the past, will get concerned within the mysteries of the dragons and turns into the chosen pilot of the Dragonaut. Serving to him on his journey is Toa, a mysterious woman who saves him from falling to his dying after the creature assaults him. As they get deeper into the mysteries of the dragons, they encounter new associates and enemies, and in addition start to develop a better relationship.