Ranger Reject, 15

After spending a year keeping vigil over Yakushi Usukubo's deathbed, D finally returns to the surface! The Alien Protection Association has faded into obscurity, the Patrol has regained its popularity, and Hibiki has risen to lead a new organization, but despite the numerous changes around him, D's ambition remains undiminished. And now, determined to free his comrades from their imprisonment in the floating fortress, D sets his sights on climbing to the top of the Patrol. A new path to world domination opens up. Disguised once again as Hibiki, he ascends to the very top of the Patrol!