Prim Snowlight, a genetically engineered scientist within the organization Alchemy, operates under Jean Luc LeBlanc’s command. Her duties encompass managing the Rampart Armors and Integral Systems, maintaining the android Kotoko-01, and tracking the biometric and psychological metrics of assigned cadets. She additionally conducts data analysis for LeBlanc while discreetly observing Misaki Kureha, a genetically enhanced test subject whose latent powers correlate with extradimensional Ghoul entities. Prim’s artificial origins forge a kinship with Misaki, compelling her to subtly prioritize the latter’s safety despite protocol. This manifests in decisions like unofficially granting cadets recuperation time—a veiled effort to shield Misaki from escalating risks. Though outwardly compliant with LeBlanc, her actions increasingly betray ethical unease, particularly as his experiments intensify. During a pivotal clash, Prim rebels by transferring her consciousness into the Kotoko-02 unit, using its augmented frame to immobilize LeBlanc and aid Misaki in subduing him. The act critically damages her original body, yet she persists, urging Misaki to focus on thwarting LeBlanc’s plans over saving her. A subsequent revelation exposes their shared genetic lineage—both engineered from identical source material, rendering them scientific siblings. This connection clarifies her initial obedience and ultimate defiance, as she maneuvers to dismantle his exploitation of Ghoul-linked experiments. In her final act, Prim disrupts LeBlanc’s dominion over the Integral System, sacrificing herself to ensure his downfall. Official records dismiss her death as a lab accident, concealing her role in destabilizing his operations. Her legacy lingers through Misaki’s continued resolve and the sustained functionality of Watcher’s Nest, her contributions quietly embedded in the aftermath.