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- The F.A. Girls have finished setting up a room for Architect in the empty space of the bookshelf that they're currently staying in. Ao prepares to go to a fireworks festival, but is met with opposition from Jinrai, who believes she shouldn't wear underwear under her kimono. Although the resulting commotion leads Ao to miss the festival, she gets to watch them on the roof with the F.A. Girls. Later, as Ao attempts to finish her summer homework at the last minute, the F.A. Girls are tasked with fetching her notebook from school at night, providing Baselard and the Materia Sisters with an opportunity to scare them by pretending to be ghosts. However, the girls soon become the target of a haunted pair of nippers , which manages to fulfil its goal by snipping a leftover fragment off of Gourai's armor. As they head home with the notebook and the nippers, the ghost girl who possessed the nippers watches them leave. Meanwhile, Bukiko tells Ao a scary story about a ghost of a young girl who haunts her school, which is the same ghost that the F.A. Girls encountered. (en)
- Baselard decides to follow Ao to school, prompting Gourai and Stylet to chase after her. Ao's model-kit obsessed friend, Kotobuki Bukiko, discovers the F.A. Girls and joins them and Ao in tracking down Baselard as she starts stealing shiny things from the school. Bukiko helps them catch Baselard using a pair of shiny nippers to lure her in. Later, two more F.A. girls known as the Materia sisters arrive and challenge Gourai and Stylet to a battle, but the latter two are having trouble working together. As the Materia sisters prove overwhelming even without any armor, Ao gives Gourai a weapon she received from Bukiko, which successfully manages to defeat the sisters thanks to Stylet's support. The sister decide to stay with Ao, to Stylet's dismay. (en)
- Another F.A. Girl named Jinrai comes to Ao's place to battle against Gourai as Ao is planning her summer vacation. Gourai agrees as Jinrai won't take no for an answer. After Gourai beats her once, Jinrai proposes a sumo match, only to lose that as well. Ao gets frustrated when they still want to fight. Later, after being forced to clean up a mess they made, the girls are given their own miniature rooms to decorate, leaving only one empty space. As each of the girls work hard to make their own personal rooms, the Materia sisters use almost all of Ao's savings for their own dollhouse room. This upsets Ao, who proceeds to chase them down. (en)
- As Gourai becomes paranoid over Hresvelgr's threats, Ao visits Hresvelgr at Factory Advance to try and understand why she wants to battle against Gourai. She explains that she is testing Gourai in order to get her to improve her skills, as she too wishes to stay with Ao due to her loneliness. She later receives a message from Factory Advance for an upgrade. Later, Ao and Bukiko go to a public bath while the F.A. Girls go to their own virtual public bath via their Session Bases. Afterwards, Hresvelgr appears in a frightening upgraded form, Hresvelgr-Ater, to once again face Gourai, notably having a different appearance and lacking the joy of battles she had previously shown. However, Hresvelgr's upgrades start to overflow, causing her to go berserk and lose control of herself. (en)
- Ao holds a hot pot party, but the F.A. Girls can't agree on what kind of hot pot to have. Upon having her hot pot, Ao inadvertently breaks one of the Session Bases used for battles after mistaking it for a hot pot stand. Just then, Hresvelger shows up to challenge Gourai to another battle, revealing that all the F.A. Girls will be recalled to Factory Advance should Gourai lose, meaning that the company might end their business with Ao. Angered by Hresvelgr's treatment of Ao, Gourai launches a powerful attack to clash against hers, resulting in a power cut that forces the match into a draw. Hresvelger again leaves after the battle. (en)
- Spurred on by Ao's wish to help free Hresvelgr from her corruption, the other F.A. Girls send all of their weapons to Gourai to help her fight the berserk Hresvelgr, since the powerful energy from the battle prevents them from personally helping. With everyone's combined strength, Gourai manages to win the battle and put a stop to Hresvelgr's rampage, who then returns to her senses. The battle also causes another power outage. Shortly afterwards, Gourai is taken by a recall drone back to Factory Advance, with Ao and the now-benevolent Hresvelgr unsuccessfully trying to stop it. Luckily, she quickly returns as it turns out to be a temporary recall for maintenance. She had also brought back a new fuse sent by Factory Advance to restore power to the apartment. Factory Advance also sends Ao an email to apologize for accidentally corrupting Hresvelgr with her new upgrade and allows Gourai to permanently stay with her. Later, on Christmas Eve, Ao holds a Christmas party to welcome Hresvelgr to the family, during which Gourai asks Ao to share her surname. Wanting surnames of their own, the other F.A. Girls decide to set off in search of their own special partners, holding a live show for Ao as a send-off. Ao hopes that they will return someday. Meanwhile, another F.A. Girl named Innocentia is in development at Factory Advance. (en)
- Ao ends up catching a cold, prompting the F.A. Girls to go to extreme lengths to figure out how to treat her. When their various methods only make things worse, Gourai learns to consider Ao's feelings and ask her how best to care for her. While resting from her cold, Ao has a dream in which Gourai and the other F.A. Girls are all regular human girls who go to school with her. After waking up from dream, she is fully recovered, but discovers that the F.A. Girls appeared to have the same dream as her and have caught her cold, which should not be possible since they are robots. Ao decides to take care of them now. (en)
- As Stylet acts strangely stiff whenever Gourai comes close to her, she assumes that some trauma is causing her to be unable to fly. After Gourai tries administering some shock therapy by kissing Stylet, Ao discovers that she had accidentally stepped on one of Stylet's parts the previous night. After fixing it, she regains her ability to fly. Later, Ao receives a seemingly broken cleaning robot from the building manager, which ends up recording the F.A. Girls as they talk about Ao's embarrassing secrets. The robot then comes alive and wrecks havoc in the apartment. After Baselard breaks the robot to keep it quiet, she faces Gourai in a battle to pay Ao back, but loses due to the dust from the cleaning robot. The building manager later sends Ao a vacuum cleaner as a temporally replacement for the defective cleaning robot. (en)
- After a successful test of Gourai's new parts, the F.A. Girls hold a pep rally for Gourai in preparation for a rematch against Hresvelgr, with Architect acting as the latter. Later, as Autumn rolls in, Ao takes Gourai to the park where she used to go as a kid. There, they come across a girl named Guriko, who leads them to a time capsule Ao had buried containing some mementos, including the Guriko doll she used to have. Guriko then vanishes, indicating that she was merely a vision. (en)
- Architect, an F.A. Girl without a physical body, intrudes on Gourai and Jinrai's battle, attacking with clones and pre-programmed subroutines that adapt to the situation. After Gourai and Jinrai manage to win the battle, Architect experiences an error in her programming, which Gourai manages to fix with her act of friendship. Afterwards, Architect receives a physical body and is delivered to Ao's place. Later, as the cleaning robot is fixed and upgraded by Bukiko and given the name Sleipni-taro, the F.A. Girls decide to use it as transportation. They then hold a race to buy some vinegar for Ao, involving four teams: Gourai and Jinrai riding Sleipni-taro, the Materia sisters riding one of Factory Advance's drones, and Stylet and Baselard; Architect is on her own. Each team faces their own troubles: Gourai and Jinrai crash in a playground and are stuck in a sandstorm caused by Sleipni-taro, Stylet and Baselard are knocked into a field by the Materia sisters where they are licked by goats , and the sisters crash into a tree. Architect does not face any trouble and manages to buy the vinegar. (en)
- While the F.A. Girls play a game of hide-and-seek, Hresvelgr, the self-proclaimed "strongest F.A. Girl", arrives to face Gourai in a battle, managing to completely defeat her. She leaves afterwards. As Gourai feels frustrated over her loss, Ao asks Bukiko about how F.A. Girls are made, helping Gouri to better understand herself and aim to become stronger. After Ao sends in a report, Factory Advance sends her boxloads of new parts to upgrade Gourai. (en)
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