Invaders of the Rokujouma!? Collector's Edition 13 (Light Novel) -

Contains the Complete Volumes 39-41Koutarou and the girls prepare to chase Ralgwin back to Forthorthe, but one mission remains before they can leave: They need to oversee the welcome ceremony for the next intergalactic transfer students! But someone who's keenly interested in both Koutarou's sword and Nalfa is watching from the shadows. The Gray Knight is dangerously close to the truth of what happened in the ruins... Will the group's rematch with him be their final showdown?After getting some important things out of the way--like RC car races, badminton games, and shopping trips--the Corona House crew heads to Forthorthe. Unfortunately, their arrival won't be the happy homecoming that Theia and Clan had imagined. They're returning with the Blue Knight, but he's only there to prevent further tragedy. Ralgwin still skulks in the shadows with terrifying new allies. Can Koutarou stop this would-be dictator from threatening the peace of the universe?