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This prequel reveals the events around when Shinjuurou and Inga first meet and the events leading to their current arrangement.
Kimura Yui has had a tragic life. After the traumatic death of her parents, Kimura has suffered yet another loss: her personal advisor, Kansaki. Now, lonely and distressed, Kimura wanders in the rain until she is harassed by two suspicious men – and subsequently is saved by an unknown benefactor while she faints and falls to the ground. Later, Kimura awakens in the house of her savior, the detective Takamizawa Kyosuke, who offers to help her discover the truth behind these murders…
In post-war Japan, the nation remains unsettled and crime is as big a problem as ever. Despite his sharp mind and keen deductions, "Defeated Detective" Shinjurou Yuuki frequently loses out to his rival, Rinroku Kaishou, whose information network has previously aided many police investigations. However, in spite of his poor reputation, Shinjurou continues to work on every case he's recruited to with his mysterious assistant Inga. With Inga's power to transform into a being capable of forcing any person to truthfully answer one question put to them, the pair uses everything at their disposal to get to the bottom of each crime and reveal the true culprit – even if the reality of who solved the case never reaches the public...
When a series of murders involving police officers occurs, chaos erupts within the police headquarters; and in an attempt to keep the citizens calm, the police decide to bury the case in the shadows. Soon, however, tragedy strikes yet again. This time the killer is after Officer Sato; he is shot in front of Ran, who promptly develops a case of amnesia and can’t remember anything – including the face of Sato’s attacker. With the perpetrator now on the loose, Conan must now protect Ran at all costs, and bring this case out of the shadows and into the light!