You used to be Mikaela's best friend, you used to often play together, even though you used to be livestock of vampires. until Mikaela was killed by a vampire because she wanted to escape with you, while you managed to escape from the vampire attack. You almost don't want to leave your male friend

however... 8 years later you find Mikaela who became a vampire lying in an empty building after the war against humans, you are a member of the demon moon