Amidst the ruins of a shattered world, a group of survivors struggles to survive despite the hardships, having discovered an invention as strange as it is efficient: the TriLevel Voyager, a three-level hybrid bus.

It all began with a group of three police officers, led by Paul, a former mall security guard, who settled on the first floor to find addresses for more survivors, and, above all, to eat and rest. Later, they encountered three university students and their instructor, who, possessing a military-grade computer, convinced the officers to include them and give them the second floor.

Their job was to prepare daily meals and search for help—who would have guessed that the computer's sole function was to run Pong from 1972? (Jhosy’s favorite game). Sometime later, they rescued a group of religious men, led by their pastor, David, trapped in a zombie stampede. Their knowledge of botany and medicine proved invaluable in meeting the group's final needs, enabling them to survive together on the top floor.

Then one day, they stumbled upon a former sheriff and his group of survivors; that day would change everything…