Seraph Experiments

Angels are used as weapons of the Japanese Imperial Demon Army. After being mentioned at the end of chapter 1, they physically appear in chapter 33. Kureto Hīragi has them prepared for transport during the Nagoya Arc as part of his plan to imprison the vampires in Nagoya.

They are live subjects, who are heavily medicated in order to force them into submission. They appear to be vital to humanity's survival, according to Kureto.