The Antarctic thaws and it is an era when most of the land has been submerged in water. The extinction of Mankind already draws near. Mankind who were born from Adam and Eve, were now deteriorating as they repeatedly get cloned from generation to generation. Things essential for the survival of living things were lost. 
Even so, the ones remaining cling on to survive... 
"We should get what we need for survival from something else...!" 
And so, a mere small group of humans began a new life upon the surface of water, exhausting the resources of each and every other living thing to survive. In the end, they discover people who posess a huge quantity of things necessary for survival. 
The young men who posessed such things continues their journey even today, to escape from those who were pursuing them. They just wanted to find that something somewhere. They were seeking for the one and only "help" there was... 
(Source: AnimeNfo)

In 2000s, human beings have lost their purana, which are essential for living thing. It means that the human species is goinig to die. However, there is a vampire who saves human beings from extinction by revealing the secret of purana. In a mythical era, there was a god who was punished eternally because he had brought the fire to the human beings. Like him, the vampire will be punished because he breaks the taboo to tell the secret of purana to human beings. That vampire is named Duo, and the vampire who punish him is Zieg. They used to be good friends... 

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