Seraph of the End
終わりのセラフ (original)
After a mysterious virus wipes out ninety percent of humanity, vampires emerge, treating mankind like livestock. But 12-year-old Yuichiro Hyakuya successfully escapes the bloodsucking captors, joining an extermination unit dedicated to killing vampires.
Starring Miyu Irino, Kensho Ono, Yuichi Nakamura, Takahiro Sakurai, Saori Hayami, Nobuhiko Okamoto, Kaito Ishikawa, Yuka Iguchi, Aoi Yuki, Atsumi Tanezaki
Watch "Seraph of the End" from streaming services Hulu Plus, Amazon released in 2015. It's a animation and action & adventure show, and has a rating of 7.4 out of 10 from Imdb which is usually fine for this kind of show.