Reipu zonbi gaiden: Hâdokoa obu za deddo

Except for virgin nerds all men in the world have become rapist zombies. The zombies of course attack women. The women who are attacked die immediately. The zombies, in the meanwhile, cannot die even if shot or decapitated. They only die if their penis is cut off. The virgin nerds began fighting the zombies in order to save the girls.