Kogoro, Ran and Conan are invited to a famous writer's house, who wants to speak with Kogoro. After they spend the night, they awake to the three residents of the house murdered! It appears each one was murdered by a different person!

In a dark room, a thief is frantically looking through an office for something. When he finds it, he smiles and cut opens a bear. The next day, the Detective Boys went to Kumamoto with Ran and Kogoro for a sightseeing trip. Kumamoto is known as the capital of water for its amazing water sources, but is also known as the country of fire for its volcanoes.