Collar×Malice: deep cover part1

Overview:

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, you become the target of an attack, and have a poisonous collar attached to your neck. With the situation spiraling out of control and time running out, five mysterious strangers appear to aid you in your quest for the truth. Who can you trust? Will you be able to save yourself and the soul of Shinjuku from the clutches of oblivion?