Ryuunosuke begins the game in Japan, where as a college student he’s involved in a certain case that puts him on the path to becoming a formal attorney. To better study law, he transfers to England along with Mikotoba, where he meets Holmes.
Most of the story will take place in London, with Japan serving as the setting for Ryuunosuke’s first case.
Court and investigation proceed in mostly the same way, but during investigations Ryuunosuke and Holmes will use “joint reasoning” - a system where, as Ryuunosuke, you must point out any inconsistencies in Holmes’ rapid-fire reasoning. (The example shown is Holmes accusing a witness of being a certain revolutionary.)
Part of the reason they settled on 3D was to allow for a very dynamic camera to match Holmes’ high-speed thinking. Takumi jokes that Holmes really set the stage for the game!
Takumi has a deep love of the Sherlock Holmes stories, so he’s trying to respect the character. Holmes is described as falling somewhere between the “storybook Holmes” and a “real Holmes” - a man who focuses maybe too much on his investigations, but isn’t a bad person at heart.
Ryuunosuke and Holmes’ meeting is a key point of the game.