On August 8, 1995, the latest helicopter "BigB" developed by the Aviation Business Headquarters of the Komaki Plant of Kin Heavy Industries for the Japanese Defense Agency was about to be tested. An important participant in the project, Yuhara Kazuaki (played by Eguchi Yosuke), came to the test flight site early with his wife and children, ready to witness this exciting moment. Some time before the test flight, Yuhara's son Takayako (played by Taguchi Shodai) boarded the helicopter, and at this time, BigB suddenly started without a pilot, took the boy into the air, and finally hovered over the Shinyo Nuclear Power Plant. Shortly thereafter, a mysterious man who called himself "Sky Bee" issued a notice demanding the immediate abolition of nuclear power plants across the country, otherwise BigB would run out of fuel and fall into a nuclear reactor. As time passed, relevant people launched a rescue operation for Takayako, and the safety of the nuclear power plant was related to the fate of all Japan... This film is adapted from the original work of the same name by Keigo Higashino.