The Demon Of Nanbaka Prison (Nanbaka x OC)

Nanbaka Prison is the safest Prison in the world. It security is the tighter then any other prisons. And it is mostly full of the male population. However, the warden has kept a secret prisoner all to herself.
One day she finally decides to introduce the mysterious prisoner to the supervisors and the inmates and this inmate will change all the lives at Nanbaka Prison.

I do not own Nanbaka