Riku thinks back to when he first met Kyoya and says this isn’t how he imagined their fight. Kyoya responds by saying that when two people on colliding paths meet, the only options are to let one person pass or push them aside and move forward. Kyoya opens fire, and Riku vows that he’ll push him aside and move forward. The Game Master asks for an update on the battle and is told that the Coalition is winning. He then tells Sarah that he understands her friends clinging to a ray of hope, but it’s an impossibility and she has to be erased to protect all Divers. Magee finds Shahryar and Tigerwolf, and the three are quickly surrounded by Rommel and other enemies. Rommel asks them to surrender, and Magee asks if saving GBN is worth Sarah’s life. Rommel answers that it is because some Divers have difficult circumstances, so GBN is the only place where they can be free. Tigerwolf tells Rommel that he’ll always be haunted by Sarah’s face when he logs in, but Rommel dismisses Sarah as mere data. Magee vows that they’ll protect both Sarah and GBN, and the Coalition opens fire. The Build Divers are pinned down, and Ayame tells Yukki that he should help the others. Yukki takes off, but many of his weapons are damaged in an attack by Emilia. In the underground waterway, Momo ejects the Petitkapool and runs past Karuna. Nanami asks Tsukasa how things are going, and he tells her that he’s done on his end, so the rest is up to everyone else now. The 00 Sky has trouble against the AGEII Magnum’s funnels, and Kyoya dares Riku to give him all he’s got. Riku then activates Trans-Am Infinity, and Kyoya activates FX Burst. Riku fires a blast from a beam blow, but Kyoya survives it and counterattacks, causing Riku to crash into the ground. The Game Master tells Sarah that the battle will be over soon. Kyoya lands in front of Riku and tells him the battle is over because his determination wasn’t strong enough to save Sarah. Suddenly, Ogre appears in the GP-Rase-Two and tells Riku that he can’t be defeated since they haven’t settled their score. Ogre then speeds forward to attack Kyoya.
Yukki’s Jegan Blast Master crashes into a forest and is chased by Emilia, but he receives unexpected reinforcement from Do-Ji’s Geara Ghirarga and Rose’s Jagd Doga Thorn. Underground, Momo is rescued by Nuts’ Maganac Cinnabar. Kyoya asks Ogre why he’s helping the Build Divers, and Ogre says that he only craves a real battle and doesn’t mind saving a world or two. Kyoya fires his rifle, but Riku defends Ogre. Riku and Ogre then activate their Trans-Am systems, and Kyoya uses FX-Plosion to counter their attacks. Kyoya causes heavy damage to both units and knocks Riku into the ground. Kyoya asks them why they still want to fight since this was a hopeless battle from the start. Riku answers that he has always admired Kyoya and loves Gunpla Battle because it lets you connect to so many different people. GBN allowed him to meet Sarah and have many experiences for which he’s grateful. The other Build Divers all chime in on how Sarah has affected them. Riku says that if their love gave Sarah life, they can’t erase her with their hands. Riku and Ogre attack Kyoya again and use special attacks to counter Kyoya’s Excalibur. Sarah declares that she wants to be with the Build Divers forever, and Riku presses on after Kyoya is defeated. Riku ejects from the damaged 00 Sky and embraces Sarah as he lands on the castle. The Game Master sees that this is the light of possibility that guides the future and declares that the Build Divers have won. Rommel apologizes to Kurt for failing him, but Kurt answers that if GBN falls, they’ll just rebuild it. With the Raid Battle about to begin in 10 minutes, Ms. Tori calls Riku and tells him that they’re ready to receive Sarah. The Build Divers return from the Avalon Force Nest and find the GBN hub city overrun by a monstrous, buggy Gunpla.
The penultimate episode resolves the Gunpla Battles between the Build Divers team and the Coalition, but there’s just nothing special about it at all. Both sides just keep repeating the same dialogue over and over about saving Sarah or GBN. When the odds are overwhelming, the Build Divers are saved at the last minute by the arrival of Hyakki. In the end, Riku somehow beats Kyoya, the GBN champion, with more gimmicks that don’t demonstrate any actual skills. Although the main conflict is resolved, like Gundam AGE, the series pulls out a random new final boss for the last episode.