An excited Hosho Reiko (Kitagawa Keiko) and her butler Kageyama (Sakurai Sho) board Asia’s largest luxury liner the Princess Reiko, which is bound for Singapore, to enjoy a rare vacation. However, not long after they sail, a murder mystery occurs on board. A peculiar dead body is dropped into the sea from the luxury liner. As the situation grows tense, they hear that man’s voice. It is none other than Reiko’s boss Inspector Kazamatsuri Kyoichiro (Shiina Kippei) who is for some reason on the same cruise … … This bothers Reiko who had been looking forward to her vacation. Then a statement from the criminal reaches the Princess Reiko. Furthermore, the transmitting signal is within the luxury liner. The criminal is among 3,000 passengers and crew, and there are five more days until the Princess Reiko reaches Singapore. While Inspector Kazamatsuri and Reiko question the passengers and crew druing the five days in order to arrest the murderer, what does Kageyama do? Because the crew have all been mobilised to investigate the murder and police the luxury liner, Kageyama is approached by passengers on various matters. He is the unknown detective who solves their requests with his brilliant deductions.
- Native Title: 謎解きはディナーのあとで ~ 船上探偵・影山
- Also Known As: The After Dinner Mysteries ~ Detective Aboard Kageyama
- Genres: Mystery, Comedy