he story begins on the end of the First "Kako" movie.The survivors meet up with a group of other barricaded survivors and they not only need to take care of the zombies but other random Greek that have taken advantage of the chaos and shoot random moving targets (zombie or not). In the meantime we take small flashbacks into ancient Greece where the zombie apocalypse has happened as well and we learned about how they faced them.

Overview from themoviedb.org