The kidnappers call Kobayakawa's phone and demands Conan's group to find the treasure before nightfall. Conan realizes that the map of Hagi has the same shape of a cat. He overlaps the picture of a cat from the diary with the map and realizes the location pinpointed by the picture points them to a temple. Once there, Conan realizes that in the previous riddle, "mouse" was referring to the English word mouth. Conan finds the next clue in a stone lantern, and explains that the opening of a lantern is called a fire mouth. The clue contains a ripped page of the diary which tells them they should go to a cave infested with Kappas to construct a map. Kikkawa directs them to Akiyoshi cave, the only cave containing a lake. Once there, Conan realizes the diary page contains panels of a jumbled map and organizes them accordingly to the cave's kanji. Once organized, the map tells them to find the pair of dragons where a fox rock shall point to a rock of light. Conan asks Kikkawa to direct them to place with two waterfalls. Upon arrival, the group discovers a shadow of a fox cast by rock formations and at the tip of the shadow, they find a rock with a mirror inside. The group pushes the rock which reveals a cave underneath and navigates through it with the help of the constructed map. At the end, of the cave, they find a shrine containing a box and are confronted by the kidnappers and their leader, Hisamichi Takahashi. Hisamichi opens the box to find a letter written by an ancestor of the Kobayakawa family which contains one of Sh?in Yoshida's lessons about willpower and its power to change a country. Hisamichi later decides to turn himself in to the authorities. Later that day, Conan reveals to Haibara that the letter contained a rare stamp worth millions of yen.