The world is destroyed by giant monsters of unknown origin and humans are forced to live in bunkers away from the terror that lurks only a few meters above them. Mechs, or mechanisms, simply put, machines with human intelligence and emotions, but do they play a role in this all? What correlation do they share with the monsters? Are the monsters even the real threat or is there something bigger? There are so many questions to be asked here and so little answers. Maybe you should start reading and find out what this is all about.