On the day when the Touto Line subway in Tokyo opened, a bomb attack against Tokyo Governor Asakura Yuichiro broke out, causing damage to the Touto Line train. After some reasoning, Conan (voiced by Takayama Minami) and others determined that this was related to the construction of the Kitanozawa Dam, which Asakura was in charge of 8 years ago. In order to build the dam, Asakura mobilized the people of Kitanozawa Village to move into the new village, but many people still resisted to the last stage. In order to find out the truth, Conan, Huihara (voiced by Hayashibara Megumi), the Junior Detectives, and Maori Kogoro (voiced by Koyama Riki) and others went to the snowy Kitanozawa. In this pure snow country, the teenagers played to their heart's content, and at the same time they also met several former villagers of Kitanozawa Village, including Yamao Keisuke, Tono Mizuki, and Tachihara Fuyumi. They are good friends who grew up together, and there seems to be some grudges and secrets between them. What is the truth... This film is the 15th theatrical version of "Detective Conan".