Saigo no Bansan~Keiji Tono Kazuyuki to Shichinin no Yougisha~

11 customers are invited to an Italian restaurant, Osteria Da Vinci, on its opening day and get embroiled in an arson murder that takes place there. Why was that restaurant targeted? Who is the criminal and what is the objective? There were at least nine customers at the time of the incident. There are a total of six victims, including the deceased and those injured. But from the situation at the scene, the possibility emerges that several guests had quietly disappeared. It is a case with many puzzles. The unconventional detective Tono interviews the owner and chef, Yagisawa (Narimiya Hiroki), and the other confirmed survivors to reveal the truth of the case.