1995. Kazama, who runs the Sunflower orphanage, had hoped that Kiryu, Nishiki, Yumi, and Miho would lead honest lives. However, contrary to his wishes, the four are ultimately plunged into the underworld of the yakuza. Meanwhile, in 2005, tensions between the Omi Alliance and the Tojo Clan are at a boiling point over a 10 billion yen heist.

1995. The Doujima Family closes in on Edgar's younger sister, who was entrusted with the official seal necessary for selling his land. Meanwhile, Yumi travels to Osaka in search of her estranged older sister. At the same time, the battle over Edgar's seal escalates. In 2005, Aiko disappears, leaving her daughter Haruka behind. Kiryu and Yumi decide to protect Haruka, but they soon make a discovery.

1995. The bond between Kiryu, Nishiki, Yumi, and Miho, who had been there for each other like family, tragically falls apart. 2005. Can Kiryu prevent a war between the Tojo Clan and the Omi Alliance? How will Kiryu and Nishiki resolve their 10-year-old conflict? And what is the true identity of the Shinjuku Devil? With rising tensions, they face the final battle in Kamurocho.