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.

A man caught poaching off the Sanriku coast is detained by Ueki (Daisuke Nagakura). He claims to be the childhood friend of Joji Sakaguchi (Takashi Kitadai), prompting Joji to head to Ishinomaki with Ishizawa (Hiroto Honda) and Yamamura (Kenta Kawasaki). The man is confirmed to be Kazuki Yabushita (Naoki Tanaka), now a yakuza in Ibaraki, secretly poaching abalone with his diver wife Akiko (Michiko Tanaka) for drug deals with the Chinese mafia. When Akiko—also Joji’s former girlfriend—is found after going missing, tensions erupt. After Kazuki assaults Akiko over a failed deal, the Yamazaki faction intervenes, but in the chaos, Kazuki and Akiko are abducted by his senior Hyodo (Yasuyuki Hamatani). Can they be rescued in time?

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.

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!

The Osaka war ended in a complete victory for the Kyowakai, finally bringing the city under their control. Yamazaki-gumi’s head, Kawatani (Hitoshi Ozawa), with Himuro (Yasukaze Motomiya) and Tamura (Yoshiyuki Yamaguchi) at his side, was recognized for his achievements and appointed as the Kyowakai’s main family Wakagashira. As Yamazaki-gumi steadily gained power, Himuro worked to expand the organization further, focusing on internal reform and establishing legitimate business operations. Meanwhile, a minor clash between Tamura’s young members and the Yanagase Rengokai sparked a new conflict, spreading across all of Gifu—another war erupting in the wake of the Osaka battle!