Vampire dragons are members of the undead. They sustain themselves by drinking the blood of others. It is said that they are only "alive" at night, and seem dead or asleep during the day, as they cannot endure sunlight for long periods of time. Vampire dragons can only reproduce by changing the eggs of other dragons, puncturing the shell with theirs fangs and injecting a venom that kills the baby inside.

Chikemuri is the younger of the Twins, and identical to her sister in almost every way. She and Chidaruma have never been apart from each other since they first hatched, and it has become something of an initiation for the elder hatchlings or recently grown adults to sit the newly-hatched down, one dark night, and warn them to be wary of the two terrifying dragons that are truly one in  soul. While the Twins have never been officially informed of this, they have an uncanny knack of showing up right after the tale-tellers have left their audience, the members of which have never failed to flee screaming at the top of their lungs when the Twins almost seem to appear out of thin air right behind--WATCH OUT!