17 hours before the Earth is obliterated in the coup-de-grace of a centuries long war, Leon and Vanny must forgo burgeoning romance and join humanity's last remaining survivors led by Colonel Jon-Azon, their enigmatic symbol of hope, as they launch the planet's final offensive against a relentless Artificial Intelligence. Leon, Vanny and the other newly drafted children of 'Terrania', the sub-oceanic city and humanity's primary stronghold, must make their first journey into the 'Over-world' - the hostile remains of a planetary surface the human race once called home