Vividred Operation

E1. First Operation

In the near-future, the world's energy problems have been solved thanks to a scientific power known as the Manifestation Engine which provides energy from the sky. On the island of Izu Oshima, Akane Isshiki is living a simple life with her sister, Momo, and her grandfather and creator of the engine, Kenjirou. As Akane eagerly awaits the arrival of her classmate, Aoi Futaba, who is travelling to the nearby Blue Island for treatment, she and Momo hear an explosion coming from their home and discover that Kenjirou has somehow switched bodies with an inanimate ferret doll as the result of an experiment. Undeterred by his new form, Kenjirou gives Akane his latest invention, a strange key, in order for her to fight against a strange alien mech, known as an Alone, that is attacking Blue Island, where the Manifestation Engine is stored.

E2. When They Overlap

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.

E3. True Strength

As Akane, Aoi and Momo begin their first day to New Oshima Academy, Akane, who was using the Vivid System as she was running late, ends up meeting kendo club member Wakaba Saegusa, who becomes shocked when she counters her attack. After Akane and Aoi officially transfer into Wakaba's class, Wakaba chases after Akane demanding a rematch until she ends up bumping into Momo, deciding to take her to the nurse's office. As Wakaba and Momo get acquainted, Akane overhears how Wakaba wanted a rematch to prove she's the strongest. After her dad tells her to think about what 'true strength' is, Wakaba formally challenges Akane to a serious kendo match, which reminds Wakaba of how fun kendo used to be for her. Just then, their match is interrupted by the appearance of a serpent-like Alone. As Wakaba comes to realise what true strength is from watching Akane and Aoi fight, she asks to fight alongside them, granting her her own ignition key.

E4. Promise

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.

E5. Another Key

Akane tries to get to know her quiet classmate, Rei Kuroki, unaware that she is the one assisting the Alone. As Akane decides to follow Rei after school, she sees her save a child from a falling piece of construction. As Rei returns home, she is visited by a crow, who punishes her for saving the child via a mark on her neck, reminding her of her mission. That night, Rei goes on a mission to destroy the Manifestation Engine by herself, but is forced to abort when she is discovered by security robots. The next morning, Akane finds her washed up on the shore and takes her back to her place to help her recover. As Rei panics when she realises she has dropped a key precious to her, Akane is called into action as an Alone appears. Meanwhile Rei, who was promised by the crow that she would able restore the world she came from and bring back her parents if she assisted the Alone, prepares to fire another arrow, but falls unconscious before she can.

E6. The Story of How Kenjirou Tries to Intensify the Friendship Power of Akane and Friends Which Results in Something Unbelievable

Whilst Akane's class goes on a summer school field trip to Shikine Island, they are requested by Mizuha to turn in their Operation Keys for the duration of the trip. Unbeknownst to the girls, this is part of an experiment by Kenjirou to increase their 'friendship power'. To this end, he 'kidnaps' Rei and puts on a phony Alone alert, leading the girls towards an obstacle course of his design, filled with all sorts of traps. Not considered in his plan, however, was Rei escaping from her hold and assisting the girls in a not-so-subtle disguise. Not wanting to be deterred, Kenjirou brings out a large mech to confront the girls, but it is defeated thanks to the combined efforts of Akane and Rei. Afterwards, Momo gets Kenjirou to apologise for his deceit whilst the others thank Rei for her help.