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"OVA Episode 00" will have two parts for a total of 50 minutes of video. The first episode will focus on the past between Kogorou Akechi and the Fiend With Twenty Faces, while the second will focus on the Boy Detectives Club before Kobayashi and Hanazaki met.
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…