A brave princess Sonya rescues a guy named Yuma. He, as it turns out later, possesses a soul of a dragon and therefore is of a great value to the Imperials. The empire seeks to gain control of the entire island of Alfheim, collecting the souls of dragons and resurrecting monsters, so they are not quite ready to give up on Yuma. And Yuma will have to make a decision: to awaken his inner dragon and to break the promise he once made to his dying mother, or to return to the imperial prison and to continue being a victim of their experiments. While Yuma is afraid of his dragon powers and does not want to break his promise, he decides to save the girls who came to his aid. As a result, Yuma meets the princess of Astoria, as well as the other citizens of the kingdom - the Astoria kingdom tries to stop the Empire's invasion. Astoria, of course, needs the help of Yuma; yet, no one has a slightest desire to make him join the Astoria's fight against the Empire, on the contrary, he will have to make his own decision.
—Scientiiaa