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.

In 1995, an overworked Miho falls seriously ill. Nishiki, deeply concerned for his sister, finds himself at the mercy of Doujima's scheme that exploits his vulnerability. In 2005, while Kiryu and Yumi continue their search for Aiko in Osaka, they encounter Chairman Goda of the Omi Alliance, who forces them to promise to return the 10 billion yen by midnight the next day.