Seraph of the End

In a world where a mysterious virus has wiped out most of humanity, leaving only children and vampires, a young boy named Yuichiro Hyakuya dreams of revenge against the blood-sucking creatures that have enslaved him and his fellow orphans. With the help of a secret organization, Yuichiro sets out on a perilous journey to destroy the vampires and reclaim his world. But as he battles his way through the darkness, he discovers that the line between good and evil is not always clear-cut, and that sometimes, the greatest monster is within.

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Some TV shows that have similar genres and were produced around the same time as Seraph of the End include Iwájú, Invincible, Sand Land: The Series, The Legend of Korra, My Hero Academia, X-Men '97.