He uses a demonic weapon to take revenge on the vampires (anime recap)

This anime is about a post-apocalyptic world where a deadly virus wipes out everyone over 13, leaving orphans to be raised by vampires. It follows the journey of Yu and his friends as they fight to survive, escape the vampires' control, and join a human resistance to exterminate the vampires.
Anime name : Seraph of the End
If you love anime, this anime is for you
Disclaimer:
This video was originally created by ‪@CentraldoAnime‬ with a longer version. We took that version and created our own recap, using our own script, editing style, and captions to make it the perfect video for you!