Have you ever seen a hundred-meter-tall giant strolling leisurely through a modern human city? Have you ever imagined a world where apocalyptic divine birds dwell in the sky, constantly overlooking the land below? Have you ever heard of a civilization claiming itself as gods, arriving from the far reaches of the stars? Since the first year of high school, Chen Du has been having the same dream every day. In his dream, there is a blue crystal, and after 30 seconds, the first wave of monsters appears. These monsters have a single goal: to destroy the crystal.