With long curly hair, a black suit, elegant manners and a modest attitude, but behind his gentle smile is a keen observation that makes all crimes nowhere to hide. This is the gentleman detective Furuhata Jinsaburo (played by Tamura Masakazu) with superb reasoning ability. In the new season, Shintaro Imaizumi (played by Nishimura Masahiko), who suffers from autonomic nervous system disorder and has been recuperating for a long time, falls in love, but unexpectedly becomes a suspect in a murder case. After this case, Furuhata and Imaizumi, the golden partners, cooperate again to meet the challenges of one difficult opponent after another, including Yurie Usami (played by Sawaguchi Yasuko), a female school teacher who killed her colleagues, Kung Fu Lin (played by Kimura Takuya), who directed and acted in the Ferris wheel explosion, Kenkichi Sendou (played by Karasawa Toshiaki), the undefeated champion of the TV quiz challenge, and the mysterious beauty (played by Suzuki Honami) who met on the trip to the United States... No matter how perfect the crime is, it will leave clues, and Detective Furuhata is the discoverer of these clues!