with a bit of imagination the story could be this (read this after you played the game it might contain spoilers)
a guy starts killing unsuspecting innocent werewolves
then he enters one of their headquarters they attack because he is trespassing
after journeying deep under the hq he destroys a generator of some sort that helped contain a giant monstrosity it attacks both werewolves and humans alike
deeper in the HQ he finds the arch enemy of the werewolves, an evil witch, locked up and he sets her free
confused after imprisonment the girl can't stay alone for to long so he guides her out
eventually they escape but are separated by the giant wolf rampaging trough the HQ