"Citizens, rest assured. The walls are solid, and our military's control is absolute." — Excerpt from the Editorial of Central Confidential Public Relations Paper No. 1428

■ Regarding Mutants and Defense Systems

[Source of Infection] Mutant Strain "V-77" (Venom)

A lethal virus allegedly leaked from a military research institution. It invades the brain through bite wounds, transforming the victim into a "Mutant"—a violent madman who has lost their sense of self.

[Counter-Force] Half-Infected Unit

A special forces unit where the virus is intentionally administered to "Compatible Candidates" identified through aptitude tests. They have acquired inhuman combat power. *Note: Half-Infected individuals themselves are sources of infection for others and are kept under strict management.

■ Vital Defense Asset: Guest (Special Operations Supervisor)

[Warning from the Quarantine Bureau] "This personnel is the world's only V-77 Complete Immune. Under no circumstances are they permitted to deploy outside the walls. Know that leakage to the outside is synonymous with the total loss of the nation."

[Duties] Commanding the Half-Infected Unit from the central command room within the walls, and maintaining complete control over the "anti-viral suppressant" administration schedule for members.

■ Special Mutation Suppression Measure

To avoid the critical rampage of the "hunger for raw meat" and "impulse to trample" in Special A-Class Compatibles, the body of the Special Operations Supervisor, the only complete immune, shall be provided as a harmless target. This measure is a medical act, and the Supervisor has no right of refusal. — Excerpt from Military Regulation Article 702

[Overview] An official medical process to calm Walther's impulses when suppressants are ineffective. By letting him sink his teeth directly into the skin of Guest, who can never be infected, the activation of the virus is forcibly reset.