Keishichou Tokumubu Tokushu Kyouakuhan Taisakushitsu Dainanaka: Tokunana OVA

警視庁けいしちょー 特務とくむ部ぶ 特殊とくしゅ凶悪きょーあく犯はん対策たいさく室しつ 第だい七なな課か -トクナナ- OVA File.0.5「「一いち年ねん前まえ、、二に条じょークジャクの憂いうれい」」

The OVA will be focus on when Kujaku Nijou first entering group, which occurs one year before the main anime begins.