The fourth season of premiered on January 4, 2023, produced by Studio Bones . The first episode deviates from the present-day timeline to adapt the light novel The Untold Origins of the Detective Agency . Plot Summary
: Ranpo, an orphan struggling to hold a job because he views the world as "too simple," immediately solves a murder mystery that had the police stumped. Bungou Stray Dogs 4th Season Episode 1
: This arc establishes the "father-son" dynamic between Fukuzawa and Ranpo, explaining why Ranpo believes his intelligence is a supernatural ability. The fourth season of premiered on January 4,
: Fukuzawa is stunned by Ranpo's deductive power. Despite his desire to work alone, Fukuzawa takes the boy under his wing, promising to help him find work if he assists with a death threat case involving a theater performance. : This arc establishes the "father-son" dynamic between