Discovering the nature of one’s individual identity is a question ! every sentient being confronts. Do you only count if you’re entirely human? What does it mean to be a person? In a war I with the alien Gauna, capable of absorbing and re-purposing human DNA. these are no longer abstract questions. In these I uncertain conditions, pilot Nagate Tanikaze finds himself developing an obsession with the Gauna clone of his deceased beloved. Hoshijiro. Meanwhile, his close friend. Izana, a | manufactured non-binary human, goes through an alarming I change as their feelings for Nagate grow. Existential and romantic problems will have to wait though, as the Gauna step up their attacks and a virtual coup d’etat threatens to throw Sidonia’s leadership into chaos, while even darker forces stir within.