Collar x Malice

As a policewoman in Shinjuku, a city turned dangerous by the brutal 'X-Day Incidents,' the protagonist is attacked one night during a call. When she regains consciousness, she finds a collar with a poisonous device strapped around her neck, capable of being activated remotely. Before her stand suspicious men—former police officers now grouped into an organization investigating the crimes on their own. Unsure if she can trust them, she becomes the key to this massive case. To remove the death-threatening collar and free Shinjuku from the malice binding it, she joins forces with them to uncover the truth. Who holds her life in their hands? Will Shinjuku ever return to its former glory?