Legend of Duo

In a world where humanity has lost its "purana", essential elements necessary for survival, the species teeters on the brink of extinction. However, a vampire named Duo intervenes, revealing the secret of purana to humans, thereby saving them from annihilation. As a result, Duo is punished by Zieg, a vampire who is tasked with enforcing the taboo against revealing this knowledge. This bond between the two vampires is a complex one, rooted in a shared past as friends in a mythical era where a god was punished for introducing fire to humanity, resulting in a similar fate for Duo.