Himuro is arrested on suspicion of assault. To prove his innocence, members of the Yamazaki Ichimon scramble to locate Ito—the older man Himuro once helped (Hiroo Otaka), who could serve as a key witness. Meanwhile, Tamura visits a certain hospital, where he is suddenly attacked by a man. After a fierce struggle, Tamura is arrested by police who rush to the scene. With the Kyowakai cornered and both Himuro and Tamura in jeopardy, the Yamazaki Ichimon splits up to continue their desperate search. Their efforts eventually lead them to Naomi (Saki Kiyoi), the daughter of Ito. As the investigation progresses, it becomes clear that the incident is tied to a gold smuggling operation. Just as the truth begins to surface, Naomi is kidnapped by the smugglers.The shocking mastermind behind the smuggling ring turns out to be an international spy organization.Can the Yamazaki Ichimon rescue Naomi—and clear both Himuro and Tamura of all charges?!

Yamamura (Kenta Kawasaki) is enthusiastically explaining his favorite anime to Tamura (Yoshiyuki Yamaguchi), while Himuro (Yasukaze Motomiya) reads a novel—creating a warm and peaceful mood in the office. Just then, Ishizawa (Hiroto Honda) arrives, carrying Himuro’s guns. Himuro takes out two pistols to clean. One is a magnum gifted by Tamura. And the other… is the very gun tied to a fateful incident between him and Tamura.

Himuro (Yasukaze Motomiya) and Tamura (Yoshiyuki Yamaguchi) returned to Tokyo to confront Okada (Yuki Matsumura). However, waiting for them was a notice of succession from the Hasekai, which was supposed to be under the Kyowakai's control. Upon learning that Okada’s faction had ties to the Hasekai's new successor, Himuro immediately severed ties, bringing the direct showdown between the Kyowakai and Marugami-kai closer. Meanwhile, Reiko (Reira Arai), who had been hiding with Genji (Kuroishi Takahiro), continued living in hiding, harboring distrust towards Genji and others. Despite this, she remained focused on her vengeance against the Kyowakai. While Himuro and the others tried to clear up Reiko's misunderstanding for Minami (Rin Asuka), Reiko refused to listen. Gradually, she became more involved with Okada’s faction, who were willing to use anything for the war against the Kyowakai.

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Himuro (Yasukaze Motomiya), who joined Kyowakai, steadily rose through the ranks with his calm and clear mind. Tamura (Yoshiyuki Yamaguchi) was also released from prison and Ryuseikai was thought to gain even more power. At that time, there is an internal split in Kyowakai as a whole, caused by an unusual executive appointment, and Himuro and others get caught in the vortex. After the conflict, the leader of the Ueda group, Ueda (Okazaki Jiro) and other gang members withdrew from Kyowakai, create a new organization called Shintokai in Kyoto, and attack Kyowakai executives.

Factional infighting erupts under the new leadership of Kudo (Hakuryu), the second chairman of the Kyowakai, worsening relations between the Mikami-gumi and the Shintokai led by Ueda (Jiro Okazaki). Amid the rising tension, Kawatani (Hitoshi Ozawa)—a benefactor to Mikami-gumi lieutenant Himuro (Yasukaze Motomiya) and Tamura (Yoshiyuki Yamaguchi)—is shot. When Tamura learns the attack was carried out by the Shintokai, he infiltrates Ueda’s residence alone and carries out the assassination. At the same time, Kawabata (Tatsuo Umemiya), chairman of the Kansai Shiseikai, begins his move to crush the Mikami-gumi, standing in the way of Himuro and his men as they climb toward nationwide domination.

The Kyowakai-Shintokai War came to a close with the disbandment of the Shintokai. While Kyowakai’s second-generation chairman, Kudo (Hakuryu), pushes forward with his ambition to unify Japan’s underworld, Kawatani remains stubbornly indecisive. Meanwhile, in Nagasaki prison, Tamura (Yoshiyuki Yamaguchi) is approached by a man bearing a ceremonial sake cup from Mikami… At the same time, Himuro (Yasukaze Motomiya) enters Kawasaki Prison, only to come face-to-face with his old rival, Akimoto (Sho Aikawa). With former Shintokai member Sugamoto joining in, a fierce power struggle erupts behind bars, where the stakes are nothing less than the yakuza crests themselves.

Himuro (Yasukaze Motomiya) is released from prison, seen off by Akimoto (Sho Aikawa). Shortly after his release, gang boss Mikami (Eiichi Furui) asks Himuro to join the crew of his sworn brother, Kawatani (Hitoshi Ozawa). However, Omiya (Kazuyoshi Ozawa), who values the old-school yakuza code and respects Mikami, grows increasingly displeased with Himuro’s casual shift of allegiance. Ignoring Mikami’s attempts to calm him, Omiya spirals out of control—raiding territories and even turning on his own men. Seeing Omiya become a living instrument of violence, Himuro steps in to stop him.

After running amok, Omiya of the Mikami-gumi-affiliated Omiya-gumi is killed. Himuro (Yasukaze Motomiya) is framed for the crime. Tamura (Yoshiyuki Yamaguchi), who admired Omiya, rebels against Himuro and declares himself the new Omiya-gumi boss. Worried about Himuro facing Tamura’s rampage, Mikami-gumi head Mikami (Eiichi Furui) entrusts him to Kawatani (Hitoshi Ozawa), the head of the Kyowakai Yamasaki-gumi and Himuro’s sworn brother. Meanwhile, Tamura heads to Osaka to elevate Mikami to the position of Kyowakai Wakagashira. Thus, the clash between Himuro and Tamura draws near.

Himuro (Yasukaze Motomiya) and Tamura (Yoshiyuki Yamaguchi) both plan their advance into Osaka, each seeking to honor their respective bosses. Meanwhile, the Yamatokai in Osaka’s Minami, who had been harboring the remnants of the Shintokai, attempts to eliminate them to avoid conflict with the Kyowakai. However, their plan fails, giving the Kyowakai a reason to declare war. Seizing the opportunity, Kyowakai’s second-generation boss Kudo (Hakuryu) launches a full-scale assault on Osaka. Thus begins the brutal Osaka war, fought for the position of the Kyowakai’s next Wakagashira!