The film starts with a bank robbery drill, when Ryotsu, playing the bank robber fails the drill by not allowing anyone to sound alarm and getting the bank money for himself. While escaping, he stumbles upon a gang of bank robbers robbing a nearby bank, thinking it to be another drill. He stops the bank robbery and saves the hostage, but the robbers run away, leaving a bomb behind. Ryotsu tries to defuse the bomb but fails, getting HIMSELF entangled in the wires. He goes to a secluded spot, still entangled in the wires. When only a few seconds are left, a woman comes down and cuts the primer wire to defuse the bomb.
The next day Ryotsu goes for a trip of the town (after being scolded by Chief Ohara!). He goes where a shrine he liked visiting was, but finds the 'Shinatora Hotel' there. He throws a stone at it and the whole building collapses.
At the police station, the officers first thought it was Ryotsu's work, but they find that it was the work of a demolitions expert. They had also got a warning by email from someone known as 'Benten Mask'.
They take help from an F.B.I Operative, Lisa Hoshino who is a bomb defusal expert.
They receive another warning from Benten Mask, this time the target being 'Shinatora Moonlight Building'
Ryotsu is sent with Agent Hoshino and Dandy to defuse the bomb. They fail to defuse the bomb and are forced to escape, however it is this failure that proves that Shinatora Company is involved in tax evasion.
Ryotsu does more of his typical things, this time writing graffiti on Dandy, for which he gets suspended. During the time he is suspended, he starts looking for a treasure, digging a cave RIGHT from his own quarters.
Another warning is received, target being 'Shinatora Ocean Building'. Agent Hoshino and Dandy are sent to defuse it. By chance, Ryotsu's tunnel ends up there itself. They find out that a girl, Asuka is still hiding in the building. Ryotsu finds and rescues her and Agent Hoshino succeeds in defusing the bomb, but the building collapses because Ryotsu had to remove some pipes to dig his tunnel. They escape successfully.
One night when talking with Agent Hoshino, the treasure that Ryotsu was finding was discovered by someone else!
Reiko tells Ryotsu that after the last incident, Agent Hoshino had said "Benten will never be back" which made Ryotsu suspicious. Ryotsu goes to Agent Hoshino's safehouse and catches her making bombs. She tells the truth of Shinatora, that they would do anything to make profit, steal children's playgrounds, spread dioxin and that she herself was Benten. She surrenders, but Ryotsu declines to arrest her.
Meanwhile the President of Shinatora company plans to use Benten's popularity for their purpose.
The next warning was about Shinatora World, a theme park. In this message, the typical logo of Benten Mask is slightly different than others.
Now Shinatora's true plans are revealed. Shinatora is using Benten's name to make profit, and get insurance claim by blowing up his own theme park. Ma-Chin had accidentally placed 2000 pounds of explosives (1 ton of explosives). Ryotsu tries to stop Shinatora, but fails. He gets the rocket containing the explosives down.
Meanwhile Agent Hoshino tells the Police Chief that Benten has stopped and that the last warning was not from Benten.
The entire town is evacuated and Agent Hoshino, Dandy and Ryotsu are sent to defuse the bomb. They bring the rocket to underground railway tracks but in the process Dandy gets crushed. They try to defuse the bomb but every tool fails. For the last try, Ryotsu tries to use a spinning top, which he picked up from a street. This technique works.
Suddenly the rocket's exhaust throws out hot flame, propelling it forward. Ryotsu climbs on the rocket. The rocket goes through the Subway Train Tracks. The police tries everything, even mining the tracks and blowing up Ryotsu to stop the rocket, but he takes an alternate route, the VERY TUNNEL he dig in search of the treasure. The live news of this incident is shown all over the world. The police asks Ryotsu of his plans to stop the bomb. He tells them to raise the Kachidoki Bridge. Ryotsu takes the rocket into the sky, using one end of the bridge as a ramp. He plans to reconnect the primer wire and jump off, but cuts both the ends of the wire. Suddenly he finds 'Shinatora Company's Plane' in the air. Saying "That's a fitting target", he turns the rocket to that plane. He crashes the rocket into the plane. A large explosion is seen, everybody thinks that Ryotsu is dead, when suddenly he drops on the parachute of the President of Shinatora Company, forcing him and Ma-Chin to land in the City Jail, the place where they "belong".
Agent Hoshino is arrested as she committed crimes, and Dandy is fixed. To take revenge, Dandy has written graffiti on Ryotsu's back! Meanwhile Ai comes RUSHING all the way to Kameari Station to meet Ryotsu. Suddenly many parts of the town collapse, thanks to Ryotsu's tunnel. From overhead view, the places from where the buildings collapsed are shown in black, forming the word for 'The End' in Japanese.
- Kankichi Ryotsu: LaSalle Ishii
- Reiko Katherine Akimoto: Yumi Morio
- Keiichi Nakagawa: Mitsuru Miyamoto
- Daijiro Ohara: Haruki Sayama
- Youichi Terai:
- Hayato Honda: Hiroshi Yanaka
- Maria: Kaori Asou
- Komachi Ono: Rieko Miura
- Naoko Seisho: Kanako Mitsuhashi
- Gomesu Tonda: Eimei Esumi
- Saigou Volvo: Yuuji Kishi
- Ryuunosuke Sakonji: Masami Iwasaki
- Ban Asato: Tadashi Miyazawa
- Oni Bakuryuu: Tetsuo Komura
- Jodie Karen Bakuryuu : Rei Saitou
- Korosuke Ezaki : Takashi Matsuyama
- Shinatora: Shirou Itou
- Maachin: Masao Komatsu
- Lisa Hoshino: Rie Tomosaka
- Dandy: Eiji Takemoto
- Retired Man: Bunmei Tobayama
- Caster (in Rio de Janeiro): Mineki Edison
- Caster (in New York): Greg Irwin
- Caster 3 (in Hong Kong):
- Announcer: Natsuko Kojima
- Middle-Schooler in Flashback: Ryou Naitou
- Reporter: Junko Takeuchi