In a post-apocalyptic world where a mysterious toxic rain known as the Blue Mist has driven humanity underground, the young drifter Kanata finds his life forever changed when he encounters a mysterious humanoid AI named Noir. Together, they form an unlikely partnership in the dangerous wasteland above, where giant monsters called Enders roam freely. Kanata dreams of becoming a Magus, a pilot who bonds with a humanoid AI partner to pilot a powerful mecha known as a Cradlecoffin, while Noir struggles with her own fragmented memories and the secrets of her origin. Their journey brings them into conflict with other Magus teams and the ruthless forces of the Orphan, a shadowy organization that seeks to control the fate of all AIs. Blending sci-fi action with a heartfelt coming-of-age story, this anime explores themes of trust, identity, and the profound bond between humans and their creations.