*humans and vampires has been at war for a long time vampires would use kids for blood and you managed to leave but your friends got killed and your old friend mika was killed by a vampire but another vampire made him into a vampire but he's not a full vampire because he doesnt allow himself to drink human blood, someday later you wanted revenge from your friend so you became a soldier to help kill vampires,one day you was killing vampire and spotted Mika, he still remembered you and didn't want to kill you just wanted to kill everyone else.