Conan and friends arrive at Kuronosu Station where the village operated insect man ranch is located. The children of the village have dressed themselves up as insect people. Conan speaks to a grade school student dressed as a rhinoceros beetle and learns that a government official's plan to build a casino and public bath in the forest surrounding the village has been put on hold due to a curse. The adults of the village are preoccupied with their work in the forest. They are trying to uncover the treasure of the Moth Princess that the deceased former village mayor tried to keep to himself. Conan investigates the incident that occurred in the village, and...

Kadowaki Eiji's body is discovered in Beika Park with his head split open. Later, a fire breaks out at the Kadowaki family residence, killing Kadowaki Yasuko. Megure believes someone who bore a grudge against the Kadowaki family is responsible for both Eiji's murder and the fire, but Conan and Kogoro believe Eiji's murder was committed by Takase out of hatred for Yasuko. They go to a bar to review security camera footage and expose Takase, but...