Before the Boy Detectives Club became legendary, before their greatest cases, two stories unfold in the shadows of prewar Japan. The first episode traces the bitter rivalry between the brilliant detective Kogorou Akechi and a criminal mastermind known only as the Fiend With Twenty Faces. Their conflict shapes everything that comes after, setting the stage for conflicts yet to come. Personal grudges blur professional lines as each outmaneuvers the other across a landscape of deception and cunning schemes. The second episode rewinds further still, introducing the young detectives before their partnership solidifies. Each member carries their own reasons for seeking truth, their own scars and secrets. When their paths finally converge, the bonds they forge will test their skills against mysteries that demand more than intelligence alone. These two episodes function as prequels to the larger story, offering crucial context for understanding the characters' motivations and relationships. Fans of period mystery and character-driven narratives will find rich material here, where past decisions echo into futures yet unwritten.