Owari no Seraph

Apocalyptic trumpets signal humanity's downfall as vampires emerge to dominate the world. Yuichiro is driven by a singular goal: to kill every vampire and seek revenge. His mission is nearly impossible since vampires are seven times stronger than humans and can only be killed with Cursed Gear, powerful weapons possessed by demons. The Moon Demon Company, an elite group dedicated to vampire extermination, refuses to work with Yuichiro unless he demonstrates a willingness to collaborate, despite his strong preference for working alone.