Tetsuya Mikami, former leader of the Mikami-gumi group, took care of ex-convicts and people who had left the group so that they could reintegrate into society. However, an incident occurred in which a man working at his store was arrested on suspicion of murder and burglary after smoking shabu. Renji Himuro and Yuto Tamura have Nakajima and his friends investigate the source of the shabu.