Fifty years after the Earth Expansion, humanity embarks on a daring mission to recreate the world map! Kuroki and Kanzaki have returned from their amazing adventure in the lost Kanagawa district. But instead of being hailed as a hero, Kuroki has been stripped of his rank by the Pioneer Council! Now, his only chance to regain his license and truly become a First Grade Pioneer is to ace the upcoming Pioneer examination. But once in the test arena, Kuroki discovers the greatest danger will come not from the monsters he faces, but from a deadly group of rival Pioneers!