After helping Koichi reach Rank D, Riku successfully registers his "Build Divers" Force. Riku and Yukki select a 5-on-5 elimination Event Battle for their Force's debut. To prepare for the battle, Riku fabricates a new backpack for his Gundam 00 Diver using The Gundam Base Factory Zone's injection molding machine while Koichi helps Momoka build her Gunpla from scratch. After Ayame is added to the roster, the Force discusses strategies for the battle. On the day of the Event Battle, the Build Divers meet Rommel, who introduces new members of the 7th Panzer Division as their opponents...