In the new SP, Hanaoka continues using his sense of smell to solve cases. He encounters a serial murder case where the corpses are covered with flower petals and picks up a mysterious smell which is supposedly used in the cultivation of bacteria. Meanwhile, Tatsuro has been removed from the investigation team thus paving the way for a mysterious profiler Shichijo Kana who had returned from the FBI to join forces with Hanaoka. Nonetheless, Tatsuro continues the investigation of the case on his own but ends up being kidnapped by a mysterious man. Hanaoka tries to find out what the smell he picked up was and goes to his former colleague Iwabuchi Yukio for help and realises that the bacteria could be used as a bioterror weapon.