Rouge and Naomi board a cruise ship headed back to Earth while Ash is on the same ship after being recalled by his superiors. Giallon also infiltrates the ship after murdering and disguising himself as a crew member. Meanwhile, Gene meets his superior, Chief Chau, who warns him that the law enforcement agency Ochrona has planted a mole within Alethia. On the cruise ship, Rouge and Naomi take the opportunity to enjoy the amenities the ship provides, and also befriend the twin brother and sister Aes and Alice. However, Giallon begins murdering random guests and crew in various disguises, sowing confusion and panic among the ship. Ash takes charge of the investigation and apprehends Naomi while Rouge searches for Giallon. Ash is wounded by Giallon in an ambush while Naomi escapes and reunites with Rouge. They manage to track down and corner Giallon, forcing him to battle Rouge on the exterior of the ship. He reveals that he was the one responsible for the death of Rouge's father, Roy Junghardt, and she angrily knocks him off the ship and sends him floating off into space. Ash witnesses the battle and finally realizes Rouge is the red Nean he has been looking for. However, when Rouge reunites with Naomi, Naomi reveals that she is an Ochrona agent and puts Rouge under arrest.