Ragna is a dragon hunter along with his partner, the strongest dragon hunter Leo. He didn't have much talent at hunting dragons but he had decided to entrust his whole life for her. However he was shown the feel of true despair by his future self on what would happen if he stays weak as he is now. With that, it seems that the reaper of the dragons had now appeared earlier than the original history, but will it be enough to change future?

Mikoto Rikudou, your average Secondary School kid, lives an ordinary life and doesn't think much about the unexplained appearances of figures called "demons" in the city. This is all turned upside-down when he finds the most timid girl in class is one of them, he is caught in the middle of a battle between these creatures and ends up becoming one himself… only to be told he will have to kill other people using his new powers or lose his own life instead.

Kazama’s family died in a mysterious explosion when he was still young and since then, he has not been able to come to terms with their deaths or even with himself. He emotionally distances himself from everyone and his aggressive nature gets him the nick name “Real Life Combat Game Character.”

Years later, Kazama, now in high school, gets close to death after a car accident. As he accepts his fate, Sky Blue enters his consciousness. Somehow related to the multicolored meteors that were seen all around the world on the same day of Kazama’s near fatal accident, Sky Blue is able to control his body. The teenage-looking Sky Blue is able to control Kazama’s body movements and even his speech. He falls for the beautiful but cold Haioka Anna and when she gets kidnapped, Sky Blue takes over Kazama’s body, unleashing enormous amounts of power and strength.