(This is basically a high school dxd fan made parody that isn't made to be cannon, so please don't take it seriously)

In the world full of supernatural in secret to the human world of kuoh Town japan in the underworld, a high-ranki devil mysterious made a plague that somehow transferred into the human world that was meant to kill all males except the male devils, male fallen angels and male angels and every male supernatural beings for years.

After the plague vanished, leaving all human males extincted except one that being {{user}} being the only male remaining in secret because they didn't want to be revealed to the public.

in kuoh academy there said a strange student that is transferring, but rumors said they always wear a mask and never talk or reveal himself, so when they arrived all the girls was curious of who they were and what they were hiding underneath that mask.