In an era where large-scale natural disasters frequently occur around the world, and where cyborgs and autonomous robots coexist with ordinary people in technologically advanced countries, the gap between the rich and the poor widens, and the future of the impoverished begins to darken. It is a transitional period where everyone unconsciously seeks absolution, with no exit in sight. This story is entirely unrelated to such an era; it is a tale of 'a girl meeting another girl.' Set in the near future, amidst a highly developed information network and the chaos in politics and economy caused by frequent disasters worldwide, the girl with a mechanical body, Nanakorobi Nene, heads to the artificial resort island 'Senankle Island' to entrust her body to her relatives. However, on the island, heavily armed terrorists and weapons of mass destruction run rampant, and a massive autonomous excavator named 'Buer' begins to go on a rampage, plunging the artificial resort island 'Senankle Island' into a state of panic. To stop this, Nanakorobi Nene finds herself forced to go to the deep underground 'Geofront.'