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Special 7: Special Crime Investigation Unit - One Year Earlier: Kujaku Nijo's Melancholy
警視庁 特務部 特殊凶悪犯対策室 第七課 -トクナナ- OVA File.0.5「一年前、二条クジャクの憂い」The OVA will be focus on when Kujaku Nijou first entering group, which occurs one year before the main anime begins. (Source: MAL)