The Kuroha-gumi is a Japanese yakuza family and subsidiary of the powerful Omi Alliance of the Kansai region. The Kuroha-gumi was led to prosperity by Tsubasa Kurosawa, who made a fortune from baseball bet-fixing, and, by 2012, Kurosawa murdered the 6th Chairman of the Omi Alliance and supplanted him as Chairman. Kurosawa was diagnosed with terminal lung cancer in 2011, and he thus planned to eliminate several high-ranking leaders of both the Omi Alliance and the Tojo-kai and centralize control of Japan's yakuza under the control of his illegitimate son Masato Aizawa. In 2012, Kurosawa sent Aizawa and Yu Morinaga to infiltrate the Tojo-kai and Shigeki Baba as an inmate at Abashiri Prison to get close to Taiga Saejima, while he also allied with Kamon Kanai of Ousaka Enterprises and Minoru Aoyama of the Tojo-kai headquarters. Kurosawa planned to lure the most powerful leaders of both the Omi Alliance and Tojo-kai to Tokyo to assassinate them as a group, planning to kill Kazuma Kiryu, Taiga Saejima, Goro Majima, Daigo Dojima, Masaru Watase, and Naoki Katsuya as a show of force. However, Katsuya discovered that Kurosawa planned to assassinate him, and he helped Majima fake his death at the hands of the Kitakata-gumi so that Majima could stealthily challenge Kurosawa's plans. Additionally, Daigo suddenly disappeared, and Aoyama turned on the Kuroha-gumi with the goal of seizing control of the Tojo-kai for himself. Aizawa and Morinaga thwarted Aoyama's seizure of power with the unwitting help of Kiryu, and Kurosawa, posing as a detective, succeeded in locating and arresting Majima and taking him to Tokyo, ensuring that his plan was still on track. Disgraced former baseball player Tatsuo Shinada also exposed the Kuroha-gumi's bet fixing after escaping Kuroha-gumi assassins and making his way to Tokyo, and Kurosawa had the coach of the Nagoya Wyverns assassinated in retribution. When all of Kurosawa's targets arrived in Tokyo, Kurosawa and Kanai attempted to assassiante them, and, while Dojima and Katsuya were critically injured, all of the targets survived the initial attack. Kuroha then sent in his army to take over Tokyo by force, but the combined forces of the Watase-gumi, Yamagasa-gumi, and Kitakata-gumi defeated his army of hitmen. Kurosawa and Kanai were arrested for their roles in the plot, and Kurosawa's death from cancer while in prison ended the Kuroha-gumi.