Energy-conservative high school student Houtarou Oreki ends up with more than he bargained for when he signs up for the Classics Club at his sister's behest—especially when he realizes how deep-rooted the club's history really is. Begrudgingly, Oreki is dragged into an investigation concerning the 45-year-old mystery that surrounds the club room. Accompanied by his fellow club members, the knowledgeable Satoshi Fukube, the stern but benign Mayaka Ibara, and the ever-curious Eru Chitanda, Oreki must combat deadlines and lack of information with resourcefulness and hidden talent, in order to not only find the truth buried beneath the dust of works created years before them, but of other small side cases as well.

For 60 years, the group of detectives known as "Detective Office 5" has raised the bar for detective work. The agents of Detective Office 5 are a group of stellar detectives lead by the genius code breaker Detective 507. When an unknown client enlists 507 to crack his most difficult programming code yet, the detective embarks for Shanghai where he crosses paths with a sniper, an informant, the head of the Blue-Dragon Mafia, and beautiful singer on the run, Meilan. As 507 stumbles deeper into a twisted quagmire of intrigue he discovers the sad truth behind the mystery.

A series of short films (Swing to Swing, Monkey Girl, Flying, Holiday, Surprise, Dead or Delivery, Coelacanth) featuring characters from the film Swing Girls (2004).