The sky suddenly cracks open, and prehistoric giant beasts intrude into the modern metropolis! Wanted by the Kronos Group, genius hacker Jack Leon originally hides out working at a dinosaur park, but gets dragged into a disaster sweeping the whole city. He teams up with the mysterious woman Amy to escape for survival, gradually discovering that behind the descent of the giant beasts hides the group's secret, and the clue to cracking the disaster actually relates to his father's past. Facing giant beasts, pursuers, and betrayal, can he save this city, and also protect the most important person?