Legend has it that the noble pure-blooded vampires in the vampire royal family will choose their own blood dependent, which may be a human or a non-human vampire. The pure-blooded vampire will ingest blood once in a fixed period of time until the blood of the blood dependent is completely assimilated into the exclusive blood of purebreds. Draining the blood of the blood dependent on a full moon night can ensure that it will never deplete without external harm.
Wells was a human picked up by Count Van Gulz, and he was kept by the count as a blood suit. The count sent him to a human school and raised him. However, these days did not last long. When the count learned of Wells's identity in an accident, he had to let him go, but he found that he was addicted to Wells' blood. When Wells grew up, he had his own thinking, and he knew what the count meant to him...