The question isn't whether they'll survive the war. It's whether they'll survive choosing who they become. Simoun builds an entire mythology around a single, devastating choice: stay paired forever as women pilots, or transition and lose the only bond that makes you matter. The show moves slowly because it knows that watching someone realize they've been running from themselves hits hardest when you see it coming and can't stop it anyway.
In the floating theocracy of Simulicram, every citizen is born female until age seventeen, when each person chooses their permanent sex. But for the priestess pilots of Chor Tempest, that choice remains suspended. Only synchronized Pairs can pilot the Simoun, ancient magical aircraft that protect the nation, and maintaining that bond means delaying,or refusing,the ceremony forever. When a devastating assault destroys most of Chor Tempest, the squadron recruits Aer as a replacement pilot. Raw and untested, she's tasked with an impossible challenge: synchronizing with Neviril, the squadron's leader, whose heart still grieves her lost Pair. The bond between Simoun pilots runs deeper than mere partnership, requiring vulnerability and trust that Neviril has locked away since witnessing her partner's death during a reckless maneuver. As Aer fights to break through Neviril's walls, the two must confront their deepest feelings while navigating a brewing conflict that threatens everything they've sworn to protect. What begins as duty transforms into something far more complicated.