A dangerous shadow organization launches a campaign of fear and violence in the city of Shinjuku, pushing society to the brink of chaos. As a young police officer tasked with restoring order, Ichika Hoshino becomes the target of an attack, and has a poisonous collar attached to her neck. With the situation spiraling out of control and time running out, five mysterious strangers appear to aid her in her quest for the truth. Who can she trust? Will she be able to save herself and the soul of Shinjuku from the clutches of oblivion?