A corpse of a clown is found in a park. Detective Shirataka Amane of Musashino Higashi Police Station begins investigating with rookie detective Uzuka Shinsaku. They find a picture of the victim holding a balloon with the number 1 and the letters TTX on social media which indicates pufferfish poisoning. Shirataka intuitively suspects that this is an incriminating statement done by a serial killer, but Chief Investigator Fukukawa Saeko denies her. Detective Kusano Seiya and other personnel of MPD First Investigative Division join the investigation, then a second murder occurs. Shirataka recalls an unsolved kidnapping and murder case from two years ago that she still regrets.

The Shimazu Clan of South Osaka, a longstanding yakuza group, built its foundation in the port cargo handling industry and maintained its independence as a traditional gambling syndicate. Tetsuo Sakuragi (Yasukaze Motomiya) formed a brotherly bond with Kenichi Kanamori (Yoshiyuki Yamaguchi) while in prison and, upon release, began serving as an executive for the Shimazu Clan. However, after two police raids disrupted their gambling operations, Sakuragi interrogates a regular customer, Hirata, and uncovers that it was orchestrated by the Koga Family. Sakuragi and Kanamori confront Tatsumi (Takashi Shigematsu) at his office, who had been manipulating Hirata, but Kanamori is shot by a Koga Family member. The long-standing cold war between the Shimazu Clan and the Koga Family erupts into full-blown conflict...!!

The eleventh 'Japan Gangster War' film.

The twelfth 'Japan Gangster War' film.

The eighteenth 'Conquest' film.

The nineteenth 'Conquest' film.

A naked corpse was found that had its penis amputated on a heavy rainy night. As a result of an autopsy by a medical examiner (Naomi Oki), it was determined that the criminal was the same man as the unsolved continuous murder case since last month. Detective Yajima (Masato Furuoya) and Ishigami (Koh Takasugi) immediately start an investigation, but the case goes in a surprising direction.

The movie takes place again in the fictional Wangan Station of the Tokyo Metropolitan Police Department the once empty space within Wangan's jurisdiction has become a popular tourist attraction. When a string of murders of company execs begins taking place, Aoshima jumps at the opportunity to pursue something other than his current case, which he finds less than inspiring. However the powers that be have other ideas, and Wangan again plays host to a special investigation team from headquarters. Aoshima's friend Superintendent Shinji Muroi, assigned by headquarters to assist Okita, is again powerless to help the local officers as decisions are made by the higher ups.

After Detective Shunsaku Aoshima is promoted to section chief he has the daunting task of dealing with eight cases at the same time, which includes a murder case, bomb threat, and a bus hijacking. Complications also arise between Detective Aoshima and his juniors.