In an alternate Japan, territorial street gangs form opposing factions collectively known as the Tokyo Tribes. Merra, leader of the Wu-Ronz tribe of Bukuro crosses the line to conquer all of Tokyo. The war begins.
After failing his university entrance examinations and being left by his girlfriend, Yuki Hirano decides to join a forestry training program only to discover that the job is much harder ...
Three years after the event of the series, Takashi Mitsuhashi and Shinji Ito face the new enemies.