Intro: Adonis, a group dedicated to purging criminals, uploaded a video of gagged and bound police offers to the public in Shinjuku. They were executed a month later in another public video. Desperate to catch Adonis, the police created the Shinjuku Quarantine Act: everyone 20 or older was required to carry firearms for self-defense. With the threat of X-Day approaching, the police are in over their heads. Ichika Hoshino works for the SRCPO department which deals with the public regarding X-Day incidents. She is ambushed one night and a poisoned collar is locked around her neck. To remove it, she must work with a group of ex-cops, but if her collar is discovered or she reveals the wrong information, Adonis will release the poison in her collar and kill her. Who is Adonis and what do they want with Ichika, the woman they claim has the makings fit for them?