Novel
A novel published under the title "K-tai Investigator 7: Sōsuke Takimoto Case File" (ケータイ捜査官７ 滝本壮介の事件簿, Kētai Sōsakan Sebun: Takimoto Sōsuke no Jikenbo?) was released November 18, 2008. It is an episode after the Zero-One incident in episode 23.
Read more about this topic: K-tai Investigator 7