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Joint Reasoning is a gameplay element found in investigation chapters of Dai Gyakuten Saiban: Naruhodō Ryūnosuke no Bōken and Dai Gyakuten Saiban 2: Naruhodō Ryūnosuke no Kakugo, in which Sherlock Holmes and Ryūnosuke Naruhodō or Yūjin Mikotoba (in The Resolve of Naruhodō Ryūnosuke) both use abductive reasoning to come to a conclusion based on logical observations made of their environment and other characters. The process involves Holmes at first making makes logical inferences to come to a conclusion. However, these are most of time incorrect due to being drawn from logical yet incorrect abduction. Afterwards, it is up to Naruhodō/Mikotoba to steer Holmes towards the actual truth, by putting his line of logic on the right track.
Cases with Joint ReasoningEdit
|Episode||Subject(s)||Topic 1||Conclusion 1||Review Conclusion 1||Topic 2||Conclusion 2||Review Conclusion 2|
|The Adventure of the Unbreakable Speckled Band||Nikomina Borschevic* (originally disguised as "Grimesby Roylott")||Identity||Defected Revolutionary||Defected Ballerina||The Crime||Kidnapped Ballerina||Smuggled Animal|
|Nikomina Borschevic and Mitrov Stroganov||The Intruder||Speckled Snake||Black Kitten||Fatal Injury||Venomous Snakebite||Tripped over Kitten* (really pushed by Borschevic)|
|The Adventure of the Clouded Kokoro||John and Joan Garrideb||The Identity of the Tyrant||The rampaging beast was a lion from India||The rampaging beast was Madame Garrideb||The Tyrant’s Bestial Fury||The hungry lion chewed up the carpet||A Fire Burned Through the Carpet|
|The Adventure of the Unspeakable Story||Robert Crogley* (As "Egg Benedict" and later "R.C.")||The Mystery Gentleman’s Motive||To dig a tunnel under the shop||To Seize the Withdrawn Article||The Great Crime||Plundering the World Fair supplementary funds||Retrieving the late Megundal’s item|
|The Memoirs of the Clouded Kokoro||Sōseki Natsume and William Petenshy* (unconscious)||Cause of Death||Death by poison from soap||Death by poison in the tea* (really in gas pipe)||Suicide or Homicide?||No guests were present during his death||Sōseki Natsume was a guest here last night|
|The Return of the Great Departed Soul||Connette Rozaic||The Wax Model's Disappearence||She sold it||The model was stolen||Where did the Model Go?||The model has already been found||Under investigations kidnapping case of "wax figures"|
|Susato Mikotoba and Enoch Drebber's room||The State of this Room||Gravity reversed in this room.||Searching for the Safe Combination.||The Missing Doctor||The doctor fled out the skylight||He's in the safe.|
|Twisted Karma and His Last Bow||Iris Watson and Yūjin Mikotoba* (covered up and unconscious)||The Gentleman's Identity||The masked gentleman is the king of Germany||The masked gentleman is Yūjin Mikotoba||The Girl's Silence||She was trying to hide the coffee cup||She was trying to hide the case files|
- Some of the abductive reasonings and conclusions drawn by Holmes are directly taken from Sherlock Holmes canon, but are made to be incorrect in the context of the episode's narrative. Sometimes this is even used to make fun of the original canon stories.