Vampire Reign 

by Takaya Kagami

In 2012 anyone aged 13 or above is killed off by a mysterious virus, vampires crawl out of the recess of the world and use the children as their livestock. Yu, Mika and their make shift family find a way to escape after years of vampire rule. On the way to escape all are killed but Yu who escapes out of the vampires clutches and into the arms on the Moon Demon Company (humans). Yu wants revenge on the vampires for killing his family.