Japan is about to host the world's largest sports festival, the World Sports Games, in Tokyo. To coincide with the opening ceremony, it has been announced that a "vacuum superconducting linear line," which boasts a maximum speed of 1,000 km/h and is the culmination of Japanese technology, will be in service between New Nagoya Station and the newly built Shibahama Station in Tokyo. While the world's attention is focused on the event, an incident suddenly occurs at a party where the famous sponsors of the event gather! What is about to happen in Japan? Postcard enclosed