After Japan's economic bubble burst the country slowly recovered, but dirty politicians still make deals with dirty businessmen so that they can both profit from the hard work of others. Keiichi Suzuki, head of Oshika Construction, and Seijiro Matsuzaka, one of the members of parliament, have a deal going on that allows Oshika Construction to use fewer materials in their projects while still letting their buildings get approved for business use. Unfortunately for them, the Government Crime Investigation Agency, the Japanese government-approved but independently-run equivalent to the FBI, is already on the move. Jotaro Zaizen, a long-thought-dead police officer, is the agent on the Ōshika case and gathers a group of people who have reasons to fight Suzuki and Matsuzaka. To help combat the GCIA, though, Suzuki hires the Haoukokuryu-kai, a yakuza group.

Absolute power corrupts in all ages and all administrations. This is a never-ending truth. The iron fist of graft in the velvet glove of government-run enterprise continues to expand the power of money-mad politicians and bureaucrats who abuse their authority, deceive the citizens, and line their pockets with financial kickbacks.
The newly established Government Crime Investigation Agency (GCIA) vows to prosecute political corruption and uproot the evil that police and the courts have failed to find. The man given the ultimate authority to lead a cavalry against political corruption is government crime investigation agent Zaizen Joutarou!

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