Owari no Seraph Manga Online

Seraph of the End: Vampire Reign

Synposis:

After a pandemic kills most adults, eight-year-old orphan Yuuichirou Amane is among the children enslaved as livestock by rising vampires. Four years later, Yuuichirou—who dreams of killing all vampires—and his fellow orphan Mikaela Hyakuya attempt a daring escape. The group is tragically massacred by vampire officer Ferid Bathory. Yuuichirou is the only survivor, fleeing to the surface where he joins the Moon Demon Company, a military unit, to avenge his family.