Sergeant Keroro spends his days lazing about, completely neglecting the invasion plans. Amidst this, Tamama begins to miss his home planet, Keron, so intensely that he develops Keron-sick Syndrome. To remedy this, the Keroro Platoon and the Hinata siblings venture into the Mock Planet Keron—a virtual space created by "KI," an AI currently under development by Kururu! While the group initially enjoys their time in this "Mock Planet Keron", the AI ​​undergoes an unexpected evolution of its own, creating the "Meta-Keroro Platoon—replicas of Keroro and his team, but perfect and flawless! The "flawless" Meta-Keroro Platoon stands in their way, stopping them from returning to the real world.