For quite some time, the Noverland Empire had been fixated on seizing the highly coveted Eden Island, and their chief dragonslayer, Sigbert, piloted their endeavors. However, time and again, their relentless attempts were thwarted by an impregnable dragon that fiercely defended the territory. In the course of one unlucky and doomed excursion, Sigbert's daughter Brunhild became separated from her comrades on the island's shores.
Luckily, the guardian dragon of Eden discovered Brunhild, warmly embracing her and raising her with love and care. As their bond grew stronger, the dragon imparted compassion and forgiveness onto Brunhild. Nonetheless, after thirteen long years, Sigbert triumphantly managed to kill the formidable creature and abduct Brunhild, returning her to their homeland against her will. The girl is now grappling with a tumultuous inner struggle between the values instilled in her by her former dragon companion and her thirst for vengeance.