Police Department Part 15: Alibi: The First Investigation Department is investigating a murder case that took place at a government agency, with particular attention to finding an alibi for the suspects. A security guard was killed in the building, the safe was broken into, but nothing was stolen. The three suspects have alibis, but who then killed the guard and broke into the safe? The 15th work from the popular series "Keishicho Monogatari", which documents the activities of the First Investigation Division of the Capital Police Department. Sonny Chiba's first film role as one of the seven detectives.