In the aftermath of Japan's economic recovery post-bubble burst, corrupt politicians collude with shady businessmen like Keiichi Suzuki of Oshika Construction and Seijiro Matsuzaka, a parliament member, exploiting others' labor for personal gain. Their illicit partnership, allowing substandard construction practices to pass government scrutiny, attracts the attention of the Government Crime Investigation Agency, akin to Japan's FBI. Amidst this turmoil, Jotaro Zaizen, presumed dead, resurfaces as the lead investigator on Oshika's case, rallying a team with personal vendettas against Suzuki and Matsuzaka. To counter the GCIA, Suzuki enlists the Haoukokuryu-kai, a powerful yakuza syndicate.