Takashi Yuki (Nao Ohmori), who has made anatomical results in order to protect the future of forensic medicine, resigned from the "Japan Institute of Forensic Medicine" with remorse. At the end of the day, a female employee hit the head with a hammer and died. Moreover, the new anatomical doctor, Keizo Nakazono (Marie Iitoyo), who examined the body, was reluctant to see the word "20P" left at the neck. What to hide 3 years ago, a younger sister, Yu (Kurosaki Reina), who had become a victim of a similar crime and has yet to return to consciousness, had a mark of "5P" on her neck! (Source: Amazon Prime)