Supernatural powers that emerge when a crime is committed are commonly known as "Sins." As violent crimes become rampant due to "Sins," detective Hizuki Koi of the Tokyo Metropolitan Police Department's First Investigative Division spends her days fighting day and night. Meanwhile, Koi is ordered to transfer to the newly established supernatural powers countermeasures investigative team, "Public Security Section 9," where she meets the cowardly detective Oboro Yushiro. As she and Oboro head off to investigate supernatural power cases, the secrets of Section 9 are revealed, and Oboro's true identity is revealed!
K-9 ~ Keishichō Kōanbu Kōan Dai 9 Ka Inō Taisaku Gakari ~ Chapter 3
K-9 ~ Keishichō Kōanbu Kōan Dai 9 Ka Inō Taisaku Gakari ~ Chapter 4