Legend of Duo  

DUO, Legenda DUO, Легенда за Дуо, أسطورة ديو, レジェンドオブ・デュオ

In the early 21st century, humanity faces impending doom due to losing "purana," a vital force that sustains all life forms. Fearing the extinction of mankind, a vampire named Duo unveiled the secret of purana to humans, averting disaster. However, like Prometheus in Greek mythology who was punished for bringing fire to humanity, Duo is penalized for breaking the sacred rule. The vampire tasked with exacting punishment on him is Zieg, his closest companion or even more than that.