Octo: Emotional Investigator Shinno Akari

Detective Shinno Akari of Higashi-Kanagawa Police Station has the ability to see the emotions of people she makes eye contact with as colors, triggered by a shocking incident 15 years ago that killed her parents. One day, an 18-year-old girl, Sakiko, jumps off the emergency stairs of a hotel with her boyfriend, Shunsuke.

Kokoro no Akari and Kazehaya Ryo are questioning novelist Suzumoto Chizuru. Chizuru's husband, Takuto, and Mikoto, a woman living on the upper floor of the same apartment building, are found dead. Mikoto was stabbed multiple times with a knife and died. Takuto was found dead with a knife still stuck in his stomach.