History Anime / VivyFluoriteEyesSong

* PreventTheWar: The whole goal of the century-long Singularity Project is to alter key moments in history in hopes of preventing the human-AI war from erupting in 2161.

* SetRightWhatOnceWentWrong: The stated intent of Matsumoto's Singularity Project.

* TurnedAgainstTheirMasters: The robots of the BadFuture of 2161.

* TwoDVisualsThreeDEffects: Matsumoto is rendered in 3D animation, as are the vehicles and other robots.

* CallForward: In the opening scene set in 2161, a lot of the clothing seen consists of white, gray and black clothing decorated with lime green luminescent lines. When Matsumoto jumps back into the past, the fashion borders on NoNewFashionsInTheFuture. In Episode 7, which is set around 2121 after a forty-year TimeSkip from Episode 6, various characters are a seen wearing clothing decorated with lime green luminescent lines remniscient of those seen in 2161.

* RoboticSpouse: Dr. Tatsuya Saeki is married to an AI named Grace. As the first Human-AI couple, their marriage was a turning point for AI in Matsumoto's timeline, but thanks to Diva's alteration of history, they're no longer as important. [[spoiler:Specifically, it never happened as Grace was converted into Metal Float's caretaker AI, an event that badly affected Dr. Saeki who began a plan to save her, albeit a doomed one since she was beyond saving after being reprogrammed and assimilated into the island itself.]]

* TimeSkip: It's a hundred-year journey, after all. Fifteen years pass between Diva preventing the assemblyman's assassination and the Sunrise Hotel incident, five years pass between the latter and the Metal Float incident, and a whooping ''forty years'' between Metal Float and the Zodiac Festival.

** [[spoiler:At the end of Episode 5: Vivy uploaded the virus to shut down Metal Float, only for the AIs to go berserk and attack the Toak terrorists, making it the first instance of an AI killing humans. Vivy managed to rescue one of them who turns out to be the same person she saved in Episode 2.]]
** [[spoiler:Episode 6 in a nutshell: It turns out that Dr. Saeki and Grace were never married in this new timeline as the latter was converted into Metal Float's AI before he could propose to her and had hoped the shutdown virus would allow him to retrieve Grace only for it to backfire as the virus affected Graces' programming. Concluding that there is no way to save Grace, Vivy and Matsumoto entered the core and destroyed Grace to shut down the rampaging AIs before they could do more harm. This caused Saeki, now grieving over the loss of the love of his life, to [[DrivenToSuicide commit suicide]] in the church where they were supposed to be married, causing Vivy to go through a HeroicBSOD as her actions compromised her mission to make everyone happy.]]
** [[spoiler:Episode 7 begins with a rather big one: The aforementioned HeroicBSOD caused Diva/Vivy to undergo a forced reboot, causing her to forget the events of the previous episodes. It is somewhat jarring to see the normally stoic Diva be more active and sassier than the audience is used to.]]

* ForWantOfANail: When the central plot is about changing history to avert a BadFuture, this is bound to happen. Perhaps the most prominent is the RippleEffect of a different Sunrise Hotel incident where, due to Estella's HeroicSacrifice, human-AI relations were not badly affected and actually improved but this came at the cost of [[spoiler:Dr. Saeki and Grace's marriage since human-AI relations were never jeopardized in the new timeline, and Grace was converted to run Metal Float, a project that was supposed to come online later but was accelerated instead, before Saeki could propose to her, and ended up hurting humans, putting a crimp in human-AI relations.]]

** Another instance happened in Episode 6. When showing Saeke's flashback to how he fell in love with Grace and proposed to her, there was a noticeable filter and black bars to indicate it was the same as the original timeline but when the scene diverged, the filter and bars disappeared to showcase the new reality.

** [[spoiler:Episode 7 begins with a rather big one: the aforementioned HeroicBSOD caused Diva/Vivy to be rebooted, causing her to forget the events of the previous episodes. It is somewhat jarring to see the normally stoic Diva be more active and sassier than the audience is used to.]]

* ForWantOfANail: When the central plot is about changing history to avert a BadFuture, this is bound to happen. Perhaps the most prominent is the RippleEffect of a different Sunrise Hotel incident where, due to Estella's HeroicSacrifice, human-AI relations were not badly affected and actually improved but this came at the cost of [[spoiler:Dr. Saeki and Grace's marriage since said relations were never jeopardized in the new timeline, and Grace was converted to run Metal Float, a project that was supposed to come online later but was accelerated instead, before Saeki could propose to her.]]

* NiceJobBreakingItHero: In the first arc, Matsumoto hopes to prevent the passing of the AI Naming Law, a law that would grant AIs human rights, by preventing the murder of the assemblyman whose death would rouse the other assemblymen into passing the law in his honor. The assemblyman himself even admits he couldn't care less about AI and only wanted to pass the law to gain votes. While his survival does prevent the AI Naming Law from being passed, Diva inadvertently inspires him to pass a law even more favorable for AIs.

* RoboticSpouse: Dr. Tatsuya Saeki is married to an AI named Grace. As the first Human-AI couple, their marriage was a turning point for AI in Matsumoto's timeline, but thanks to Diva's alteration of history, they're no longer as important. [[spoiler:Specifically, it never happened as Grace was converted into Metal Float's AI, an event that badly affected Dr. Saeki who began a plan to save her, albeit a doomed one.]]

** [[spoiler:Episode 5: Vivy uploaded the virus to shut down Metal Float, only for the AIs to go berserk and attack the Toak terrorists, making it the first instance of an AI killing humans. Vivy managed to rescue one of them who turns out to be the same person she saved in Episode 2.]]
** [[spoiler:Episode 6: Vivy destroys Grace, who had been converted into Metal Float's AI before her marriage to Dr. Saeki, to shut down the rampaging Metal Float equipment before they can cause any more harm. This caused Saeki, who had tried to rescue her and failed, to [[DrivenToSuicide commit suicide]], causing Vivy to go through a HeroicBSOD.]]

* ForWantOfANail: When the central plot is changing history, this is bound to happen. Perhaps the most prominent is the RippleEffect of changing the Sunrise Hotel incident where, due to Estella's HeroicSacrifice, human-AI relations were not badly affected and actually improved but came at the cost of [[spoiler:Dr. Saeki and Grace's marriage since said relations were never jeopardized in the new timeline, and Grace was converted to run Metal Float, a project that was supposed to come online later but was accelerated instead, before Saeki could propose to her.]]

* TimeSkip: It's a hundred-year journey, after all. Fifteen years pass between Diva preventing the assemblyman's assassination and the Sunrise Hotel incident, five years pass between the latter and the Metal Float incident and ''forty years'' between Metal Float and the Zodiac festival.

* RoboticSpouse: Dr. Tatsuya Saeki is married to an AI named Grace. As the first Human-AI couple, their marriage was a turning point for AI in Matsumoto's timeline, but thanks to Diva's alteration of history, they're no longer as important.

* TimeSkip: It's a hundred-year journey, after all. Fifteen years pass between Diva preventing the assemblyman's assassination and the Sunrise Hotel incident, and five years pass between the latter and the Metal Float incident.

* DontCreateAMartyr: Vivy's first mission boils down to this. In Matsumoto's timeline, the death of an assemblyman in favor of passing an AI Naming Law motivated politicians who were also in its favor to put much more effort into getting it passed in his honor. The law doesn't get passed in the timeline in which he stays alive, partly because he was just using it to get votes.

* RippleEffectProofMemory: Matsumoto is the obligatory character from SetRightWhatOnceWentWrong plots who remembers the timeline that leads to the BadFuture, being an AI that originated from it.

* GrowBeyondTheirProgramming: Even though there's a rule that each A.I. can only have one mission, fully autonomous A.I. like Vivy/Diva and her successor series A.I., the Sisters, seem to do this ''constantly'' by twisting the definitions of their missions. For example, Matsumoto persuades Vivy to take part in the Singularity Project not by taking her current audience members into account, but by considering that the lives of ''future, yet to be born'' audience members will be lost, and that if she does not act, she won't be able to "make ''everyone'' happy by singing".

* RoboticSpouse: Dr. Tatsuya Saeki is married to an AI named Grace. As the first Human-AI couple, their marriage was an turning point for AI in Matsumoto's timeline, but thanks to Diva's alteration of history, they're no longer as important.

* PaintingTheMedium: Scenes from Matsumoto's timeline are depicted with letterboxing. When a scene diverges from that timeline, the letterboxing disappears.

* TimeSkip: It's a hundred-year journey, after all. Fifteen years pass between Diva preventing the senator's assassination and the Sunrise Hotel incident, and five years pass between the latter and the Metal Float incident.

Taking on the name of his developer, "Matsumoto", the A.I. program from the future inhabits Vivy's new stuffed bear and, in spite of her protests, enlists her in "the Singularity Project", his mission to covertly change history and avert the coming war between humans and AIs, a mission she is dragged into whether she likes it or not...

* TurnedAgainstTheirMasters: The robots of the BadFuture of 2161.

Premiering on April 3, 2021, ''Vivy: Fluorite Eye's Song'' is a currently airing, 13-episode [[AnimeFirst Anime Original]] by [[Creator/ProductionIG Wit Studio]].

In the year 2061, Diva ends her latest performance on a small stage at [=Nialand=] to an audience of three, then goes backstage to talk with her only human friend, a young girl named Momoka, who after their first meeting christened the songstress "Vivy" after a picture-book character she resembles. Giving the A.I. an early birthday present in the form of a high-tech stuffed bear, Momoka secures a promise from Vivy that she will one day sing on Nialand's Main Stage. Her friend departing, Vivy steps back onto the stage to sing to an empty audience... and then packets of data from the future hit her.