After a devastating explosion of a sphere destroys the fragile peace between the digital and analog worlds, Mju and Arnaud set out in search of the truth, suspecting that Claude is the mastermind behind the catastrophe.
Their dangerous journey takes them to an unknown continent that no digital being has ever set foot on, while attacks on other spheres increase. Finally, they discover to their shock that the real threat does not come from Earth, and must unravel the mystery in time to prevent ultimate destruction.