Noir is a forgotten city in a corner of the world where natural laws do not apply. For longer than Rinnie could count, a strange and deadly plague called Angel has infected humans with the Ann virus, capable of mutating its bearer's body into a hideous beast. The only way to survive is by being the predator, and this is clear to Rinnie; However, her internal conflicts and goals will be confronted when the Angeltrash Death Service receives the only mission that would give her a headache.