In a world where the Blue, enigmatic entities possibly dating back to 2017, rise to dominate Earth in 2031, surpassing humanity, rumors swirl of their origin as a weapon gone astray. However, it becomes clear that these insectoid behemoths are not man-made. With humans fleeing to space to evade the Blue's wrath, Yuji Kaido awakens from stasis after two decades to a grim truth. Now, Yuji grapples with the daunting responsibility of safeguarding the fate of humankind against these formidable creatures.