Things are looking pretty grim with the VIRM’s purple nerve networks overwhelming the blue of the Klaxo princess as Hiro continues to suffocate. However, just his presence in Strelizia Apath’s cockpit seems to have delayed the VIRM self-destruct booby trap the princess triggered.
But he only delayed it; Hiro’s friends and allies have just 72 minutes to do something before Apath blows and takes Earth with it. Just as that countdown begins, Zero Two arrives at the control room where Franxx and Hachi are observing events…and she promptly passes out.
When she comes to, she learns from Franxx that she is a clone of the princess, the last surviving member of a Klaxo Sapiens species that fought a millions-of-years-long war with the invading VIRM. That war changed the once-cosmopolitan Klaxos into sterile war machines, just as humans have become something similar.
Franxx created Zero Two from DNA from the princess so that humanity had someone on their side who could operate Star Entity. He created the human Nines so that she had backup. Reuniting her and Hiro was simply a “scientist’s whim.” For her part, Zero Two doesn’t care about clones or fakes or the VIRM; she just wants to fulfill her promise.
To do so, she has to get back to Hiro in Strelizia Apath. Since the path to the Grand Cradle is sealed and can only be accessed by the princess, Franxx comes along. Right on time, Squad 13 arrives to escort them, bringing a much-needed smile to Zero Two’s face. Time is running out, but it looks like they’re going to make it.
Kokoro, Michiru, Miku and Ikuno stay behind to fend off the VIRM that followed them, so that escort shrinks to one: Delphinium. When they arrive at the door, another VIRM attacks and Ichiro and Goro keep it away from Zero Two and Franxx by grabbing it and jumping off a ledge to an uncertain fate.
Franxx reveals Zero One DNA in his left arm, which the tentacles of the door snatch (with little regard to Franxx’s human parts), and a Klaxosaur snake arrives and opens wide for Zero Two to ride to the Cradle, leaving Franxx behind. One by one, people are sacrificing their lives to give Zero Two the smallest of small chances of stopping the end of the world.
Before leaving Franxx, rather than curse him for what he did to her, as he fully expects her to do, she thanks him for creating her and allowing her to meet her Darling. Love, in Zero Two’s case, trumps hate.
When she arrives, things are bad; both the princess and Hiro are unresponsive. But Zero Two won’t accept it. She kisses Hiro in hopes of taking away the burden of the VIRM infection. Zero One watches in spectral form and is moved (as much as an ancient sentient weapon can be “moved”) to lend to Zero Two what remains of her powers.
In mid-kiss, Zero Two and Hiro share a moment in an idyllic setting, in a wintry place that looks similar to the forest to which they escaped years ago. They kiss in this place too, and in the real world Strelizia Apath “hatches” from the shell around the cradle, and launches a massive beam that obliterates the VIRM fleet in space. In the ensuing chaos, Franxx is crushed, but got to see his life’s work realized, and the world saved because of it.
The VIRM snatch Hringhorni from Strelizia and retreat, vowing to return with a full army (it’s somewhat frightening that what we saw was just a “small detachment” and not at all representative of their full force). But for now, at least, the world is safe.
Time for a big party with good food, good friends, and good conversation, right? Except that the fleet-destroying attack seems to have taken everything Zero Two had. She’s slumped in the cockpit, unresponsive, and her red horns have crumbled.
Could this be the end for Zero Two; one last sacrifice to keep the world alive? And is there any kind of world in which Hiro wants to even live that doesn’t have her in it? I’d predicted often that Zero Two would eventually bite the dust early in the show, a la Kamina, but the fact we’ve (presumably) lost her with just three episodes left somehow hurts all the more.