Octo: Emotional Investigator Shinno Akari S01 E02 Episode 2

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.