Himuro (Yasukaze Motomiya) and Tamura (Yoshiyuki Yamaguchi) receive a request from their now-retired old patriarch, Mikami (Eiichi Furui) regarding harassment by the Chinese mafia on his ward, Oomiya Hayato. While Himuro and Tamura investigate, the Yamazaki Family kill time by dealing with merchandise fraudsters, YouTube streamers, and holding a seance to possibly consult the dead ...? Originally a 16-part "workplace comedy" online sketch series hosted on Rakuten TV, "Hiragana Ichimon" was released as a full movie cut on other platforms such as U-Next, while Netflix Japan retained the 16-part cut.

The Yamazaki family arrives at Akikawa Station and heads into a cicada-filled forest to carry out a mission assigned by Headquarters Chief Tamura. With bug nets in hand, they excitedly begin their search, spotting a praying mantis and later a stag beetle—only to be startled by a sudden “black shadow.” After the scare, they finally find a rhinoceros beetle and celebrate like kids again. Having achieved their real goal of bonding, they spend the rest of the day playing in the river and enjoying a barbecue. Once fully relaxed, the general producer takes on the role of MC, and the group sets aside their characters to enjoy a “real summer vacation” as fellow actors. In the laid-back atmosphere, they share candid memories of joining Unification of Japan (Nihon Touitsu), their fellow Yamazaki members, and their feelings toward the director.

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.

Having been appointed Second Generation Yamasaki-gumi Wakagashira, Himuro (Yasukaze Motomiya) expanded his influence across Gifu and Shiga, making his name known even in political and business circles.However, this led to lingering tensions with the Hiroshima-based gangster group Genseikai.Under the orders of Kyokai Kaichō Kudo (Hakuryu), Himuro and Tamura (Yoshiyuki Yamaguchi) intervened in the succession dispute of Nagoya’s largest organization, the Shigemitsu-ikka.The conflict with Genseikai brought Himuro significant losses.Although the situation was calmed with the help of Akimoto (Sho Aikawa) and others, the power balance in Kansai was profoundly shaken.

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!

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!

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) 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.

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.

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.