Collar x Malice is a visual novel, and follows Ichika Hoshino, who is patrolling Shinjuku, Tokyo. She is attacked, and a collar with poison is placed around her neck; following this, she becomes involved with the "X-Day Incident", which is being investigated by five former police officers.

Collar x Malice is a visual novel, and follows Ichika Hoshino, who is patrolling Shinjuku, Tokyo. She is attacked, and a collar with poison is placed around her neck; following this, she becomes involved with the "X-Day Incident", which is being investigated by five former police officers.