An intense disagreement with a man named Oripus unleash a conflict that may lead dragons to their doom. Only a dragon named Dario stands against Oripus after received prophetic visions and tries to save the dragons from annihilation.
Leon is a dragon who was adopted by a lovely couple after of his father's dead and the murder of his species. Leon as an older dragon, he has doubts about his origins and the search for the truth will take him to meet his first enemy.
When Leon meets Mary Steel, they go to a military base where Cosmo and Wanda are safe, but the lab is shut. The security guards leaded by Blaster along Mary and Leon find out something dangerous has been released in the lab.
Leon, Cosmo, Wanda, Blaster and Mary are the only ones left and when Mary checks a video file revealing the secret project called The Demon Force Project, Leon and company will have to join forces and fight to keep out alive.