Usui - Japan's most unfortunate detective - and Fujimori - a capable profiler who can't read the atmosphere - team up in order to reveal the truth behind a recent case of multiple random attacks. Usui - who got transferred from the criminal division to the equipment department - witnesses one of the stabbing attacks first hand in front of a train station. After arresting the suspect without a warrant, he is tasked to join the following criminal investigation and returns to his former workplace