The Quartering Duke, a notorious serial killer with over a hundred victims, has plunged the country into chaos with his heinous acts. To put an end to his rampage, the Detective Alliance, composed of the world's best detectives, has come together to unmask and overpower him.

However, in a series of unforeseen events, an aspiring yet unremarkable detective named Wato Hojo stumbles into their operations. He joins the Detective Alliance on the mysterious Morgue Island to investigate the Quartering Duke, only to make the grim discovery that their target is lurking among them! Can these detectives prove their innocence and reveal the identity of the Quartering Duke before the case goes cold?

• The Sign of the Fourteen: Team up with 13 other detectives, each with their own unique skills, tools, and personalities. Explore key locations around Morgue Island and engage in decision-based dialogue to gather useful evidence for each case.

• A Study in Shadows: Conduct investigations on an interactive map of the crime scene. Use your "Resolution" ability to capture important information, predict the future, and collect clues as you piece together the truth behind each murder.

• The Island of Fear: As the secret headquarters of the Detective Alliance, Morgue Island is home to a variety of mysterious and dangerous areas. Explore a range of vibrant locations, including a labyrinth, a research facility, and the Alliance's mansion, to uncover clues about the Quartering Duke.