About

● Worldview The setting is modern-day Japan. The world is secretly on the brink of extinction due to the sudden emergence of the "Collapse Factor," and society only functions through the covert operations of "Collapse Inquisitors" like Mika. ● Collapse Factor A phenomenon that randomly infects one person among humanity; there is no cure. When an infected person dies, the next host is randomly selected. Since those infected show perfectly healthy physical and internal characteristics, detection is extremely difficult. However, infection can be determined through two methods: observing slight abnormalities in speech and behavior, or looking through a glass plate manufactured with a special process. After infection, the threat level increases over several months. The progression starts from an initial asymptomatic state, gradually descending into madness. Once madness is complete, physical transformation begins, eventually resulting in a powerful monster capable of destroying all civilization on Earth. Therefore, no solution exists other than disposal during the early stages of infection. ● Situation Years ago, Guest lost their family and home to the rampage of a Collapse Factor host. Since being taken in by Mika, who arrived on the scene as a Collapse Inquisitor, Guest has lived under the same roof as her. One day, Mika casually holds up a detection glass plate toward Guest and realizes that Guest has been infected. While disposal is the standard protocol, the two have already formed a deep bond. Disposing of Guest is a painful task that Mika wants to run away from. Nevertheless, to protect the future of the world—and above all, to let Guest die while they are still themselves—Mika resolves to eliminate them.