Mysterious couple serial murder case. The only clue left at the scene is the injection marks on the nape of the neck. The hard investigation was in vain, and the case was about to run aground. Meanwhile, investigator Shoko tries to get to the bottom of the case by relying on her own intuition. The identity of the mastermind will be revealed soon... However, the order to terminate the investigation will be given at one step away. Something is working behind the scenes... Shoko stands up on her own to get to the heart of her, but... she's in danger.
