- Drama: Butterfly’s Mechanics: Murder Analysis Squad (literal title)
- Romaji: Chou no Rikigaku: Satsujin Bunsekihan
- Japanese: 蝶の力学 殺人分析班
- Episodes: 6
- Release Date: November 17 – December 22, 2019
- Runtime: Sunday 22:00 – 23:00
Toko Kisaragi (Fumino Kimura) is a detective in the Investigation 1 Section 11 of the Tokyo Metropolitan Police Department. Her senior, Detective Hideaki Takano, has decided to move to the Public Security Bureau. Hideaki Takano’s transfer will be carried out in 1 week. During this time, a murder takes place. A wealthy man is found dead in his home. His throat has been cut and a blue flower placed within the wound. Also, the victim’s wife Mayumi is missing. A newspaper then receives an email from Kurasuta 16, professing themself as the murderer. The email also implies the location of Mayumi. Since Detective Hideaki Takano is soon to transfer to the Public Security Bureau, Toko Kisaragi feels more pressure and responsibility to solve the crime.