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Subaru Nakajima and Teana Lanster are taking a test to increase their rank from C to B. During the test, Nanoha, Fate, Hayate, and Rein observe their progress. Near the end of the test, Teana injures her ankle, but Subaru has a plan to complete the test in time.

Subaru and Teana are informed that they have failed their promotion exam, but are given another chance by Nanoha and Reinforce to take the exam again in a week. In the meantime, they are told about the Sixth Mobile Division, which is a special division about to be formed and led by Nanoha, Fate, and Hayate. Erio and Caro make an appearance and meet for the first time.

Hayate's dream of this new unit has finally been realized and the training begins for the new recruits. New characters are introduced which gives insight to the new villan's plot of the Lost Logia named Relic.

Subaru, Teana, Caro, and Erio are still enduring hard training with Nanoha, but soon their training will be complete. They are given new upgrades to their devices and the power-limiting feature is explained to them. Afterwards, the Sixth Mobile Division must act on their first mission.

This episode marks the first mission of the new teams, as they battle several droids to recover a Lost Logia. Subaru and the others get to test out their new and improved devices. Part of Caro's past is revealed, as well as her true ability. Someone is monitoring them from a lab, gathering data mostly on Fate and Erio, who have a connection with "Project F".

Stars and Lightning undergo further training, intended to enchance their strengths and skills. Meanwhile, Hayate requests the aid of Major Genya Nakajima's 108th Ground Forces Battalion to assist Mobile Division 6 in investigating smuggling routes. Fate and Shari discover that a Doctor Jail Scaglietti is implanting Jewel Seeds into the Type-3 gadgets.

The Sixth Mobile Division monitors, and provides security for, the Hotel Augusta, where works of art, including lost logia, are up for auction. Teams Stars and Lightning face gadget drones, and another summoner who has ties to Dr. Scaglietti.

Following an averted friendly-fire incident at the Hotel Augusta, Teana throws herself into intensive training. Subaru joins her, and they devise a dangerous strategy for their next combat exercise with Nanoha. Has Nanoha taught them well enough to avoid hurting themselves at all costs?

Teana wakes up in the infirmary many hours after being on the receiving end of Nanoha's attack. She and the other young recruits learn about Nanoha's past and how she almost died several years ago on a mission due to having overextended herself, causing Teana to understand Nanoha's training methods.

Subaru, Teana, Caro, and Erio are on their vacation. Suddenly, Erio sensed a magical presence, and follows it. To Erio and Caro's surprise, they see a girl coming out of the sewers. What was attached to that girl's foot was a relic case!

Nanoha, Fate, Shamal, Teana, and Subaru come to aid Caro and Eriol. Eriol, Caro, Teana, and Subaru go down the sewer to investigate. They meet up with Subaru's sister, Ginga, but things take a turn or the worse.

Everyone is under attack, and Hayate comes to help. Lutecia and her companions come to get the relic. When they retrieve the relic case, they open it only to find something unexpected inside.

Explained how Agito joined Lutecia and the reason why Hayate created Mobile Section Six.

The main point is that Nanoha and Fate have adopted Vivio, the girl with the Relic as their child.