Shota Himuro (Tsubasa Sakiyama), a detective in the Second Organized Crime Countermeasures Division, is found stabbed to death. Rio Kanzaki (Chiaki Kuriyama), who was there, was shocked. Himuro was Rio's junior, and she had just met her for the first time in a while and had dinner a few days ago. Satoshi Itomura (Takaya Kamikawa) is curious about the gold chain that Himuro was carrying, but he has no idea if it belongs to something...
It turns out that while he was alive, Himuro was following the dark website organization 'Mole' that illegally traded insider information. In addition, it is understood that in the past few days, Hazuki (Nami Morihi), a maiko, and Ryusuke Iwase (Kanji Tsuda), a former police officer and security guard, have gone to see each other. He seems completely ignorant and says he has never seen a chain.
In the midst of this, the fact that Himuro frequently browsed investigative materials related to past murder incidents surfaced. Himuro's death, the dragon, and the random incident--what kind of connection do these three incidents have?!
Itomura and the other members of the Special Countermeasures who continued their diligent investigation eventually ran into an unexpected person. That person is Yasuhiro Mononobe (Hideki Takahashi), the director of a large hospital who has a strong connection to the political world, but...!?