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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.
The film will feature a three-way battle between The Gentlemen Thief Empire, the Genius 4, and the Milky Holmes groups. Just as the Milky Holmes group is settling down to relax at a hot spring after their study tour, an alarm goes off, because The Gentlemen Thief Empire intend to steal a treasure. The two groups start to battle for who gets to use the "Toys," when suddenly the Genius 4 rush to the scene.