I forgot one of my favs!!! I would say this would actually be #4 its called:
Seraph of the End
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This is about a boy named Yuichiro who is from an orphanage. When he was a kid, everyone 13+ died from a virus. From vampires. Him and the whole orphanage were taken captive by vampires. Something happens which I won't say what, and he gets older and he wants to kill vampires. Badly. Badly wants too. His BEST BEST BESTTT friend from the orphanage when he was a kid, comes back when he's older. Yuichiro thought he was dead. His name is Mikaela, and he comes back, but as a vampire. This is AN AMAZING ANIME watch it :3
