Watch Isolation Letter (2005) Official Trailer

The Sannō-kai is a yakuza organisation based in Kobe. Tanooka (played by Hitoshi Ozawa) managed to quell internal power struggles and rise to the position of second-in-command, but by cutting ties with a long-standing brother-in-arms who resented this decision, he left a lingering grudge within the organisation. Amidst this, an attack is launched on Ryūzōji (played by Tamio Kawachi), the third-generation chairman of the Sannō-kai, by a group affiliated with the Umeyama-gumi!