Cinthia is an English nun on the run from mysterious supernatural beings who decimated her home... but the only person who will provide her with refuge is a brutal dominatrix in Kabukicho, the biggest red light district in Tokyo.

From ADV:

Sosuke has finally lost his mind - and his memory! Rehashing his previous exploits will keep Kaname busy, but it doesn't take long for the military mind of this soldier to bounce back with a bang - literally! He's locked, loaded, and back to his old self by first period, as bombs and bullets grace the halls of high school!