All action spins around difference of humans from Earth and young giantess girls from Greatia. They are humans as well, but their height is 42 meters. Giantess girls (greatlings) behavior can be absolutely different: from killing, eating, crushing and humiliating earthlings, to treating them as equal, just more tiny then themselves. Relationship between earthlings and greatlings often depends on location of Earth and personality of greatlings. All greatlings are different as well as earthlings.