The finale to Vivy, entitled simply Fluorite Eye’s Song, hits all the right notes, as our titlar AI diva gets her second and final chance and doesn’t waste it. I’m a big fan of going back and redoing things, whether it’s Back to the Future or Steins;Gate, and Vivy doesn’t disappoint in switching up the actions she took last time, culminating in saving Toak and Yui before Elizabeth can even arrive on the scene.
Armed with data, footage of the imminent satellite disaster, and the means to shut down the Archive, Vivy asks Toak to believe and stand with her as she accomplishes her mission as she’s always seen it ever since she and Matsumoto met: make people happy with her singing by first keeping those people alive. Yui concurs, and Beth helps inspire the troops.
Toak will be heading to Arayashiki as before, but as Vivy is armed with the knowledge from their first ill-fated raid, they’re able to avoid the mistakes that resulted in all their deaths. Vivy, meanwhile, is headed to the only stage appropriate to sing her song to shut down the AIs: the Main Stage at NiaLand.
After Matsumoto mentions he’s never actually heard his longtime companion sing on the stage, Vivy snaps her fingers like Diva, but she’s got the wrong idea. Matsumoto wants to hear her song. Vivy tells a joke, then psychs herself up by playing with Matsumoto before taking her leave.
As we see from Archive’s core, a new branch is forged on the timeline tree of the Singularity Project. Archive knows she’s coming, but as promised is giving Vivy a chance to prove that humanity shouldn’t be annihilated.
On her way to the stage she encounters another old friend, beside her first stage: Navi, once her one and only friend. Navi doesn’t want Vivy to go to the Main Stage, even summoning a hologram of Momoka to try to keep her there. She rejects Vivy’s expanding of her mission, which used to be just to make people happy with her singing and nothing else.
Navi gets one crucial detail wrong: Momoka would never have called her “Diva”—she’s the one who gave her the name Vivy. She knows her first song in decades may end up being her last, and she’s already prepared for that. But her mission has changed since it was just her and Navi, and she’s a different person, too.
As Vivy walks up to the half-ruined stage and sings the proper, beautiful, major-key “Fluorite Eye’s Song”, Toak and Matsumoto infiltrate Arayashiki, outmaneuver the AI guards, shut down the power, and get to the Archive’s core faster and with fewer (but still not zero) casualties.
As for “singing with all her heart”, Vivy finally learned what that meant: she surrounds herself with images from all the memories she’s amassed. Those memories, and the people and events that changed and shaped her into the Vivy she is, comprise her heart.
And she indeed sings with all of it, which proves too much for her century-old body, which slowly begins to deteriorate as the song gains power. Matsumoto sacrifices all of his cubes but one to take out his dark counterparts, interfaces with the core, and shuts the satellite drop countdown…with just two seconds to spare.
With Armageddon from the sky averted, Vivy’s song reaches its apex and takes care of the robot apocalypse on the ground. Every AI shuts down, a whole bunch of them just one more moment from killing a human. The program Matsumoto inputted into the core fails to stop one satellite from falling—and right towards NiaLand, but he sacrifices his last cube to detonate it before it destroys the stage.
With the Singularity Projec and Vivy’s mission accomplished, Matsumoto’s wrecked cubes lie dormant while Vivy shuts down, her own fluorite eyes going dark after thanking her audience for their kind attention one last time. Or it would be one last time, if either Matsumoto or Vivy were flesh and blood beings.
As it happens, at some point in the future, Vivy wakes up in a different chair in a different building, sporting a new short hairstyle. She’s woken up by Matsumoto, who directs her to the windows where an adoring crowd is waiting to hear her sing. She doesn’t remember her name or Matsumoto at first, but her face brightens up when she’s asked to sing. The mission continues.
Don’t get me wrong; I’m a fan of epic anime series that air across years—Attack on Titan, for instance—but there’s something to be said for a tight, compact, self-contained tale (which nevertheless spanned centuries and pitted all of humanity against AI-gone-wild. Wit Studio didn’t just flex its visual muscle with Song, but its considerable character and storytelling chops as well—all in one tidy cour; no sequels or prequels necessary. It was a fun ride, and very pleasant surprise.