Keishicho Tokumu-bu Tokushu Kyoaku-han Taisaku-Shitsu Dai-Nana-ka: Tokunana OVA File 0.5

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」

Episode 0.5 included in the second Blu-ray volume. The episode focuses on Kujaku Nijou, when he first joined the team, one year before the anime begins.