Owari no Seraph

Seraph of the End

In 2012, a virus wiped out 1/10 of the human population which allowed the vampires to take control and enslave what remained of the humanity. For the next four years, Yūichirō Hyakuya along with members of his orphanage are livestock for vampires but he and his friend Mikaela plan to change that. One night, they plan their escape along with the other children of the Hyakuya Orphanage which comes at a terrible cost. Losing all the members of his family, Yūichirō manages to escape to the outside world where he joins the Japanese Imperial Demon Army's Moon Demon Company in order to exact revenge on the vampires who killed his family.

Source: http://www.animenewsnetwork.com/encyclopedia/manga.php?id=16088

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