As Kenjirou instructs Akane and Aoi to undergo 'docking', Aoi receives her own Ignition Key, allowing her to also transform using the Vivid System. Receiving weapons to go along with their new abilities, Akane and Aoi begin fighting against the Alone whilst protecting the innocent. Meanwhile, Kenjirou contacts the head of the Manifestation Engine's management bereau, Yuuri Shijō, in order to gain military support in assisting the girls in fighting the Alone. After knocking out the Alone's core, stopping its movement, Akane and Aoi attempt the Docking Operation, but it fails due to one of them subconsciously rejecting the fusion. As Aoi worries that she might be the one causing it to fail, she thinks back to when she first became friends with Akane, who gave her a tomato on their first meeting. Meanwhile, a mysterious girl fires a glowing arrow into the Alone, bringing it back to life and changing it into a more powerful form. As the girls find their attacks ineffective against the Alone's new form, Aoi confesses to Akane that she actually hates tomatoes, the reason the docking failed being that she didn't want her to find out when their memories combined. Akane tells her that she already knew about that, but admired her perseverence to eat them regardless and assures her they are best friends. Reconfirming their friendship, Akane and Aoi perform the Docking Operation, fusing together to become Vivid Blue and combining their strenths to destroy the Alone. The next day, as Akane, Aoi and Momo discover their school has been obliterated as a result of the battle, Mizuha Amagi, an officer for the National Defense Force, informs them they are being transferred to a new school.

Akane, Aoi and Wakaba's latest fight against the Alone are observed by Himawari Shinomiya, a girl who spends her days confined to her room and participates in classes through a camera. Following the battle, Wakaba starts training Akane and Aoi so they can safely dock in battle. As the girls attend gym class, Himawari spots Kenjirou through her robot's camera as he investigates who's been hacking access to files on the Alone, before it is smashed by a wayward baseball hit by Akane. The girls go to Himawari's apartment to apologise, where Himawari asks to inspect Kenjirou, which Akane passes off as a stuffed toy named Uso. Noticing Himawari has a thing for factories, the girls dress her up and take her to see one of them. Just then, the factory they are visiting is attacked by the Alone from the previous day, which had undergone an evolution. As the girls transform to defeat it, Himawari heads to the plant to shut it down, but soon gets caught up in a cave-in. Recalling how she was betrayed by her previous friend, which led to her to become a shut-in, Himawari is rescued by Akane, who kept her promise to come back for her. Touched by this, Himawari gains an ignition key, joining the girls in their fight. After the Rei powers up the alone again, Akane docks with Himawari to become Vivid Yellow and defeat the Alone. Following the battle, Himawari decides to start attending classes before asking Kenjirou for his autograph.