Background

According to legend, the vampire "Cain" will be resurrected a thousand years after his death. This legend is little known in the human world, with only the Holy See and the League of Hunters still recording it.

On the night of her 18th birthday, Isabella, an orphan living in the town of Lotsville, didn't know she was a vampire and a human child, and on the night of her 18th birthday, the moon turned blood red, which meant the vampire "Cain" was about to be resurrected. The Holy See dispatched a mission to the head of the Holy Knights, asking him to follow the trail of "Cain" according to the guidance of the Holy Artifact.

With the passage of time, Isabella inexplicably gained some powerful powers, she didn't know anything about it, whether human beings can escape this disaster...