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Seraph of the End: Vampire Reign.
The story takes place in a world where an unknown virus has killed the entire human population except for children under 13. Those children were then enslaved by vampires. The manga centers on Yuichiro Hyakuya, a human who dreams of becoming strong enough to kill all vampires. (Source: Anime News Network)
12 aired or completed episodes listed in the metadata. Video availability can vary by episode and provider.