Today, we'll be covering the story of how Shion finally got fired from Vector.

While Jin Uzuki investigates Gnosis Terrorism—a new phenomenon in which Gnosis under a person’s control attack high-population centers—he finds a mysterious young Realian girl being taken care of by the Subcommittee on Close Encounters and Juli Mizrahi. The Subcommittee lab is attacked, and an agent named Doctus, who was sent by an anti-UMN organization called Scientia, kidnaps the Realian girl. Jin and Shion pursue Doctus to a Scientia vessel and are caught. The Captain of the vessel attempts to explain the situation to them, revealing the dangers of the UMN and Vector’s role in funding the research that led to the events on Miltia 14 years ago. As Scientia conducts an analysis on the Realian girl, a power awakens in her, and Shion is rendered unconscious as the Realian disappears from the lab. Jin works with Doctus to conduct an encephalon dive into Ars Nova, a top-secret area of the UMN sealed by Vector. There, Jin confronts Grimoire Verum, the father of Nephilim and the orchestrator behind the recent Gnosis attacks. Grimoire attempts to use the Realian as a vessel for his daughter’s consciousness, but the Realian girl rejects her memories, and the song of Nephilim turns her into a Gnosis. Grimoire’s consciousness is destroyed, but Shion is able to help the Realian regain her memories, calling her by her true name, Almadel. It is revealed that Shion’s father had experimented on Almadel, and Shion had befriended her and tried to comfort her in her distress. This also unlocks repressed memories for Shion. Almadel then realizes that she must sacrifice herself to stop the Song of Nephilim from resonating throughout the universe. Shion has an emotional breakdown in response but is roused and comforted by Jin. As a result of this incident, Shion is demoted within Vector, but due to her conflicted feelings about Vector’s involvement in all of this and their attempted coverup, she leaves Vector without saying goodbye to KOS-MOS and joins Scientia.