Sakuma and Azazel get involved in an incident while traveling to Ryujinko Onsen, which they won in the lottery. Hanasaki Mayu's senior, Kensaku Nishimura, whom he had just met, was lying in the hallway covered in blood. In front of everyone who gathers in the lobby to identify the suspect, Hanasaki reports that Nishimura and blogger Yoshiko Kobayashi had been arguing before dinner. Kobayashi suddenly ran away from the investigation of Souji Hashiba, a detective who happened to be there, and disappeared on a cape where rough waves were crashing. Suspects who appear and disappear one after another. Just when it seemed that the investigation was about to run into difficulties, it was Azazel who guessed the identity of the real culprit, the Angry Dragon God, through outstanding reasoning (?)!?