History Anime / VivyFluoriteEyesSong

* 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 [[spoiler:Estella's HeroicSacrifice]], human-AI relations were not badly affected, and actually improved. This came at the cost of [[spoiler:Dr. Saeki's marriage Grace since human-AI relations were never jeopardized in the new timeline. Before Saeki could propose to her, Grace was selected to run Metal Float, a project that was supposed to come into fruition years later, but was completed earlier due to the new timeline's accelerated AI progress. During the assault on Metal Float, Grace inadvertently harmed people in self-defense, putting a crimp in human-AI relations.]]

* Bookends: The story begins with [[spoiler: Vivy collapsing before performing in front of nobody and ends with Vivy collapsing after performing in front of nobody.]]

* BittersweetEnding: [[spoiler:Vivy manages to sing her song on the Nialand Main Stage, shutting down all the rampaging AIs and ending the war. Unfortunately, this also includes Vivy as the program shuts down all the AIs, leaving the second Elizabeth as the only Sister AI left operating. However, a new Vivy was apparently built and, while not having the memories of the original Vivy, is free from the burdens and trauma that the original experienced and thus, she can sing to make people happy while carrying on the legacy of the original. That said, it should be noted the "old" Vivy's body was left pretty much intact, while the "new" one immediately starts singing Vivy's song after Matsumoto tells her to let everyone hear her voice. As a result, it is possible this is still the "old" Vivy, just rebooted, and that her memories are still in there somewhere. To top it off, she wakes up in a physical recreation of her old Archive room, which might mean people are actively trying to recreate the old Vivy, not just give the world a successor.]]
* BadFuture: The original timeline's year 2161, when AIs across the world rose up to destroy humanity.

Premiering on April 3, 2021, ''Vivy: Fluorite Eye's Song'' is a 13-episode [[AnimeFirst Anime Original]] by [[Creator/ProductionIG Wit Studio]] with a story jointly written by [[LightNovel/ReZero Tappei Nagatsuki]] and [[VisualNovel/ChaosChild Eiji Umehara]].

* HeroicSacrifice: The ending of the Sunrise Hotel arc, in which [[spoiler:Estella and a reconfigured Elizabeth stay on the Sunrise after evacuating everyone else on board to ensure that it breaks up and burns in the atmosphere. While in the original timeline Estella was known as the most defective AI in history, in the new timeline she's seen as a hero.]]

* {{Expy}}: Even though he's cubical instead of spherical and definitely doesn't turn evil, Matsumoto's egotism, {{jerkass}}y attitude and [[MotorMouth the inability to shut up for even 5 minutes]] make him eerily similar to [[VideoGame/Portal2 Wheatley]]. He's also incredibly expressive in his cubical form.

* {{Expy}}: Even though he's cubical instead of spherical and definitely doesn't turn evil, Matsumoto's egotism, {{jerkass}}y attitude and [[MotorMouth the inability to shut up for even 5 minutes]] make him eerily similar to [[VideoGame/Portal2 Wheatley]].

* BrokenRecord:[[spoiler:At a certain frequency, Dr. Saeki was able to intercept Grace (now Metal Float's AI) singing 'Sing My Pleasure' on a repeated loop which he interpreted as her cry for help for him to save her but Diva/Vivy concluded that it was tone data that was not wiped out when she was reprogrammed and the Grace he loved was gone for good. [[WordOfGod However, the writers' Twitter post on the episode]] left even that ambiguous and up to interpretation.]]
* BittersweetEnding: [[spoiler:Vivy manages to sing her song on the Nialand Main Stage and shut down all the rampaging AIs, ending the war. Unfortunately, this also includes Vivy as the program shuts down all the AIs, leaving the second Elizabeth as the only Sister AI left operating. However, a new Vivy was apparently built and, while not having the memories of the original Vivy, is free from the burdens and trauma that the original experienced and thus, she can sing to make people happy while carrying on the legacy of the original. That said, it should be noted the "old" Vivy's body was left pretty much intact, while the "new" one immediately starts singing Vivy's song after Matsumoto tells her to let everyone hear her voice. As a result, it is possible this is still the "old" Vivy, just rebooted, and that her memories are still in there somewhere. To top it off, she wakes up in a physical recreation of her old Archive room, which might mean people are actively trying to recreate the old Vivy, not just give the world a successor.]]

* 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 [[spoiler: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. Before Saeki could propose to her, Grace was converted to run Metal Float, a project that was supposed to come into fruition years later but was accelerated and completed earlier instead, and in an attempt to shut her down, she ended up hurting several humans when metal float malfunctioned due to said attempt, putting a crimp in human-AI relations.]]
* GrandfatherParadox: It turns out that Vivy's impulse to [[spoiler:save Yugo Kakitani]] during her first few missions was intended to avoid one. [[spoiler:Osamu Matsumoto's creator's higher-up in the Toak moderate branch is Yugo Kakitani's granddaughter Yui]].

* TheNamesake: The final episode reveals that the eponymous Fluorite Eye's Song is [[spoiler: the title of the song that Vivy spent twenty years to compose.]]

Premiering on April 3, 2021, ''Vivy: Fluorite Eye's Song'' is a currently airing, 13-episode [[AnimeFirst Anime Original]] by [[Creator/ProductionIG Wit Studio]] with a story jointly written by [[LightNovel/ReZero Tappei Nagatsuki]] and [[VisualNovel/ChaosChild Eiji Umehara]].

* BittersweetEnding: [[spoiler:Vivy manages to sing her song on the Nialand Main Stage and shut down all the rampaging AIs, ending the war. Unfortunately, this also includes Vivy as the program shuts down all the AIs, leaving the second Elizabeth as the only Sister AI left operating. However, a new Vivy was built and, while not having the memories of the original Vivy, is free from the burdens and trauma that the original experienced and thus, she can sing to make people happy while carrying on the legacy of the original.]]

* TwentyMinutesIntoTheFuture: The main part of the story starts 40 years after the anime release, with technologies like robotics and artificial intelligence are incredibly advanced by 2021 standards, and only get more impressive as time goes on.

* CreativeSterility: AIs are unable of creating something new on their own, [[spoiler:until Vivy writes her first song. This turns out to have given the BigBad an extra reason to consider humanity obsolete in the corrected timeline]].

* TwentyMinutesIntoTheFuture: The main part of the story starts 40 years after the anime release, with technologies like robotics and artificial intelligence are incredibly advanced by 2020 standards, and only get more impressive as time goes on.

* TwentyMinutesIntoTheFuture: Although the main part of the story ostensibly starts only 40 years from now, technologies like robotics and artificial intelligence are incredibly advanced by modern standards, and only get more impressive as time goes on.

* CreativeSterility: AIs are subject to this, until [[spoiler:Vivy writes her first song. This turns out to have given the BigBad an extra reason to consider humanity obsolete in the corrected timeline]].

* BittersweetEnding: [[spoiler:Vivy manages to sing her song on the Nialand Main Stage and shut down all the rampaging AIs, ending the war. Unfortunately, this also includes Vivy as the program shuts down all the AIs, leaving the second Elizabeth as the only Sister AI left operating. However, a new Vivy was rebuilt and, while not having the memories of the original Vivy, is free from the burdens and trauma that the original experienced and thus, she can sing to make people happy while carrying on the legacy of the original.]]