Miman Keisatsu: Midnight Runner Episode 6

Nine years ago, there was a serial murder case where the body of the victim was slaughtered and buried in the ground with a shovel left next to it at the crime scene. At that time, the police arrested one of the victim's husband, but in the present time, a similar case occurs again! Honma and Ichinose witness Tenma Tomoya visiting the police academy and pointing a gun at professor Ranko in a classroom! (Source: Hulu)