The Resistance tells the Build Divers that while investigating the Silver Tower they found a door that they couldn’t open, so they need help. Hiroto sees that the door has a shape to fit an object, and the pendant that Muran gave them earlier fits into the shape. Kazami wants to proceed, but May thinks they should withdraw because the enemy probably knows they have the pendant. Hiroto comments that the enemy must’ve given up the Silver Tower without a fight because they’re waiting for them in space at the other end of the orbital elevator. Hiroto wants time to prepare for a space battle, and Gorus notes that most surrounding areas are short handed due to the Resistance gathering most of their forces at Seguri, so the most they can wait is three days. Kazami thinks the difficulty level will be higher for the last mission, and Parviz wonders why the enemy would invite them up to space. Later, the Build Divers reconvene in the GBN lobby and discuss how Parviz and Hiroto developed new parts. The mission begins, and they transfer out of the lobby. In the village, Jed tells the children to behave and says goodbye to Maiya. Jed comments that he didn’t intend for Freddie to join battles, but he’s proved more useful than expected, so he’ll leave the matter alone. Jed notes that no one else can use the ruins like Freddie, and Kazami thinks he might be their Goddess of Victory. Unbeknownst to anyone, Stola sneaks into a supply box loaded onto a Resistance car. The Build Divers travel to the Silver Tower and open the door with Muran’s pendant. They then board the elevator in their Gunpla and ride it up to space, which Kazami comments is Gundam-like. Parviz comments that he never expected they’d get this far since they started out as complete strangers. He says that they slowly became a team, and he feels like they can fight as a Force now. The elevator reaches space, and Freddie is amazed to see the planet Eldora below them, which confuses Kazami since he believed Earth was the setting. Calico and Zabun open up the crate and find Stola hiding inside it. Stola apologizes and tells Jed he’ll do anything since they’re shorthanded. Calico and Zabun suggest that there might be a job he could do, but Jed refuses and tells Stola to return to the village immediately. The Build Divers reach a space station and find several rocket boosters instead of a shuttle. Suddenly, purple lights appear and light a path to the Moon. The Build Divers ride the boosters toward a lunar base and enter it. Kazami is disappointed to find no enemies in the base and wonders if all that’s left is the final boss. Freddie has trouble moving around in zero gravity, and Kazami complains about the lack of handrails usually seen in Gundam. As doors open along the path, Freddie comments that it seems like someone is inviting them in. The group reaches an empty control room with multiple monitors showing battles from GBN. A glowing purple being appears and welcomes them.
The purple being states that he has been waiting and seeking and was ordered and named Alus. When he reappears in another part of the room, Hiroto concludes that he’s a hologram. Alus says that he’s been protecting and asks why they haven’t returned yet. He asks if they’re different ones and when “someday” is. Kazami doesn’t understand what Alus is saying and thinks it’s a weird story development. He wonders if Alus is the final boss, and Alus states that eternity forgot him when he woke up. May asks what he means, and he answers that there was another similar to him, but different. He changes his appearance to each of theirs and repeats his questions. He asks if he must still keep protecting by himself, and Kazami wonders if he’s mistaking them for someone else. Hiroto thinks that he’s confirming something, and May asks Alus who he’s waiting for. Alus asks why they’re with “that thing,” referring to Freddie. Freddie asks Alus if he’s in charge of the One-Eyes and why they attack the villagers, who did nothing wrong. Freddie states that they were all just quietly living their lives and tending to the land given to them by the Creator. Freddie says that Alus isn’t protecting anything, but instead just destroying things. Freddie begs him to stop, and Alus summons a ball of light and sets off an alarm. Kazami wonders if they triggered the wrong route, but May doesn’t think so. Kazami wants to start over and says they should go back to the others. Alus asks if there’s someone else, and Kazami mentions the Resistance in Seguri. May tells Kazami to shut up, and Alus pulls up a video image of Eldora with a space view of Seguri. He initiates an emergency request to cancel target protection and changes the area to a battle area. May pulls out a gun and shoots several floating objects surrounding Alus, and the group escapes the room. The floating objects give chase and fire beams. Hiroto and Freddie board the Jupitive Gundam, followed by Parviz in the Valkylander, Kazami in the Justice Knight and May in the Wodom Pod. All the doors in the base suddenly close, so May fires her cannon to create a path back to space. The Build Divers emerge in space and discover that the Moon isn’t a whole planetary body, but rather mostly a large cannon. Large groups of One-Eyes appear in space, led by the Gundam Seltsam.
The Story mission moves to space, and some new mysteries are introduced. First, Freddie mentions that the name of his planet is Eldora, which is a name that has never been featured in any previous Gundam series. Second, they encounter the mysterious artificial lifeform, who bombards them with questions that relate to whatever his programming is. The dialogue doesn’t go well, since Kazami blurts out the existence of the Resistance and Seguri, which Alus decides to target. The Build Divers manage to reach space, where they discover that the moon is mostly a large cannon surrounded by a debris field. Of course, things get worse when an army of One-Eyes appears, led by the Gundam Seltsam. This is all definitely the set up you’d expect for the final mission of a story.