-CHASE- 未解決事件捜査課 ～遠い記憶～

The Cold Case Unit of the 3rd Tokyo Metropolitan Police Department. Two detectives worked in the unit that never stepped outside: An eccentric, Shounosuke Nanase, and a self-proclaimed elite, Koto Amekura. Wasting away their hours with nothing to do was a regular occurrence, when suddenly they received a phone call.

An explosion that took place 5 years ago. “It was not an accident. It was murder.” A suspicious phone call from an unknown caller spurred them to re-investigate a cold case with no leads whatsoever. Was it really a murder case…? Interviewing the young man who caused the explosion was as good a place to start as any. “If the probability is not zero, then that means there’s a possibility!”