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The story is set in an alternate world called Yamauchi, ruled by the Yatagarasu clan, who are able to transform between human and crow forms. Yukiya, a beautiful and eccentric Yatagarasu boy, is chosen to serve the young prince. While encountering various events in the conspiracy-filled imperial court, he forms a strange master-servant relationship with the young prince.

Kabuto is a tengu who has to save a princess from fortress which is full of monster-mecha hybrids in an alternate reality of feudal Japan.

500 years ago in the Tensho Era of Japan, a man was born who defied the will of a demon; a man who had gods of good on his side; a man destined to battle evil....his name was Kabuto. Somehow, Kuroyasya Douki, the vile Black Night Demon, escaped his prison in hell and returned to the earthly plane to wreak vengeance on the family-line of Kabuto. None can escape his deadly magic and masterful skills with the blade; however, the gods of the North, West, East, and South band together to help Kabuto stand for Justice. With the questionable help of a diabolical talking sword that his own father forged, Kabuto may live another day to see his own sons born....

The city of Shinjuku in the near future. A wave of multiple murders has hit, shocking even for this crime-wracked city. The victims are always drained of their body fluids... and there is always a sole survivor. Behind the murders stands Ekou. For centuries, he was the Karas, the guardian of the town, but he no longer heeds the will of the city, and is intent on destroying it.There is only one hope for Shinjuku — Otoha, the one who is to be the new Karas. He must now battle Ekou's forces to save the city and its inhabitants, be they human or youkai.