Dirty Pair 91: Kunoichi (also known in Japan as "Daatipea91: Kunoichi") is the second radio series based on the Dirty Pair franchise which began on FM Osaka on 15 October 2007. This time written by Takachiho himself, it places eighteen-year-old Kei and Yuri in Japan in the year 1791 as student ninjas who find themselves embroiled in political affairs of the period. Horie Yui and Minagawa Junko reprised their voice roles. Again, a streaming broadcast was available. This series was re-broadcast during March to April 2009.

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