100 years ago Humans was on war that last  30 years long....considered war lasted so long ,some scientist try to end the war by make zoonic beast,a beast or an animal that has been gene manipulated...which was also the first gene modification in history.Human who were on verge extinct created Zodiac,A multi purpose mechanical armor which covered majority of your body and  equipped by special O.S(Operational system) which using Species of animal,insect and even mithycal beast way of act..This system boost your overall performance and how your brain works..For example Bear program,which boost short-range ability and allow the unit too make the brain prioritize do short range attack,this is a tale to make the strongest nation in history using 12 Zodiac whis ability able to demolish 1 country