Demon City Shinjuku

In the near future, the human world exists parallel to a parallel world of demons and dark magic. The two have long abided by an uneasy peace treaty, but its time is almost up, and a new one has to be negotiated. Now, two agents--a top human agent and a beautiful assassin from the other world--must protect the only man who can seal the treaty from dark world renegades or die trying!

Thousands of years in the future, the world is overrun by demons and vampire lords. Doris, a young girl, has become the target of the great vampire lord Count Magnus Lee, who wants her as his plaything. After being bitten by the Count, she seeks the help of D, an elite vampire hunter, who decides he must venture out to slay the Count and his demon underlings to save this girl in despair.

In feudal Japan, Kurou and his servant Benkei are fleeing from Kurou's elder brother, who has recently ascended to the throne. In a forest, they come across a house and a strange woman by the name of Kuromitsu, who agrees to harbor them under one condition: that they do not peer into the inner chambers. Soon, they are attacked by the Red Army; they are searching for Kuromitsu, whose blood holds immortality. Fatally wounded, Kurou drinks some of Kuromitsu's blood and gains immortality along with strange abilities; but shortly after, Kurou is seemingly decapitated and wakes up centuries later in a ruined city. In this twisted future the Red Army is omnipresent and still searching for Kuromitsu’s blood, while a rebel army seeks to keep them from acquiring it. With threats at every turn and fueled by his obsession, Kurou sets forth to find Kuromitsu and seek his revenge on the Red Army.