Plot summary

Tetsuo Okita is a former businessman who lost his manufacturing company to bankruptcy and separated from his wife and son a year earlier. Desperate to make ends meet and start over, he collaborates with activist Masaru Koga and his former employee Hiroshi Oshiro in an elaborate plot to extort money from the government.Hikari 109 is a high-speed 0 series bullet train carrying 1,500 passengers from Tokyo to Hakata. Shortly after the train's departure, railway security head Miyashita is notified by Okita that a bomb has been planted aboard and will explode if the train slows down below 80 km/h. As proof of the bomb's efficiency, Okita tells Miyashita that a similar bomb has been placed on freight train 5790 bound from Yubari to Oiwake. When freight train 5790 indeed explodes, Hikari 109's conductor Aoki is informed by Shinkansen director Kuramochi not to slow down the train below 120 km/h while the security personnel aboard the train search for the bomb - thus delaying the trip to Hakata by three hours. Police officials back in Tokyo are tasked to either find the bomber or the bomb first.Back aboard Hikari 109, passengers start becoming weary and demand the train stop when security does a second search. For the duration of the journey, Kuramochi must coordinate with Aoki on timing the train's speed and position to avoid incoming traffic while keeping it safe from the speed-sensitive detonator. Okita calls the National Railway authorities again; this time, he demands US$5 million in an aluminium suitcase in exchange for the safety of Hikari 109's passengers. As the Prime Minister prepares the ransom, police find their first lead when a cigarette pack containing fingerprints of Koga are found at Yubari station prior to freight train 5790's departure.Meanwhile, passengers aboard Hikari 109 start to panic when the train passes through Nagoya, with a pregnant passenger named Kazuko Hirao going into labour. As a means of settling down the passengers, co-engineer Kikuchi tells them of the bomb on board. National Railway officials are in further disdain when they realize that the bomb is attached to one of the train's wheels. Okita once more calls the officials and tells them to send the money northbound via helicopter and land at Yorii High School. Officer Senda, who carries the suitcase, is then instructed to cross the Arakawa River; upon reaching Iwate, the suitcase is roped and pulled up a cliff by Oshiro. However, Oshiro is forced to drop the case and retreat when police yell at a university judo team jogging nearby. Fleeing via motorcycle, Oshiro finds himself tailed by several squad cars until he collides with one and is killed after hitting a light post.The passengers once again panic when a businessman threatens to pull the emergency door latch open as the train passes through Shin-Osaka; they are further exacerbated when they hear of Oshiro's death on the radio. Meanwhile, police locate Koga, but fail to arrest him, despite wounding him during the chase. Koga limps back into Okita's hideout to have his gunshot wound tended. Okita ponders on giving up his mission, as he has failed to prevent any bloodshed, but Koga convinces him to carry on. As the police trace the bomb parts to Okita's former company in Shimura, Okita makes another phone call and tells Miyashita to drop the money at an abandoned truck by the Kanda motorway in 10 minutes. After the police do as instructed, Okita takes the suitcase and makes his getaway. Back aboard the train, Kazuko loses her baby in a miscarriage and is in need of a blood transfusion. Okita then calls Miyashita and tells him to pick up a diagram of the bomb at Sun Plaza cafe in Shinbashi. Unfortunately, the cafe is destroyed by fire by the time police arrive. When the police surround Okita's hideout, Koga blows himself up with a stick of dynamite rather than turn himself in.With no other options left, Kuramochi goes on television to make an appeal for Okita to help them disable the bomb. On the train, Shinji Fujio, a former accomplice of Okita being escorted after his arrest, reveals that Okita is on his way out of Japan using a false name. With the help of high-speed cameras, the Shinkansen authorities manage to locate the bomb underneath the second coach. Kuramochi relays the information to Aoki and sends a rescue train to provide welding equipment to cut an access hole where the bomb is. Aoki succeeds in defusing the bomb, but the authorities suspect a second bomb is located elsewhere underneath the train. Despite this, the government gives the order to stop the train. Aoki manages to stop Hikari 109 without incident. As Kuramochi leaves the main control room to regain his composure, he discovers that his appeal is still being broadcast on TV. Miyashita explains that this is part of the police's trap for Okita. Overwhelmed by the pressure of the day's situation, Kuramochi resigns from his position.Meanwhile, at Haneda Airport, Okita prepares to board his flight, but his cover is blown when his ex-wife Yasuko Tomita and son Kenichi spot him. He is shot dead while attempting to escape outside the airport.