This drama tells the story of the humane detective Showa and the ruthless detective Reiwa, who challenge a long-unsolved incident that is actually on hold.The generation gap partner between Showa detective Chiju Tobi, played by Sorimachi, and Reiwa detective Fuwa Riki, played by Sugino, will rely on some clues to get closer to the truth of the incident that is about to be revealed.