Five years after the Shibuya riots, the Tribes of Tokyo have been enjoying a period of relative peace, until Kim and two other members of the Musashino Saru intrude on the territory of the Wu-Ronz in Bukuro. Mera, the leader of Wu-Ronz kills the three Saru, under the assumption that they were members of the Shibuya Saru.

Two days later, after searching for who killed his friends, Musashino Saru member Kai runs into Mera. Old friends in their high school days, the two get into a confrontation that ends up leaving Tera, the leader of Musashino Saru, dead and setting the stage for violence between the Tribes.

(Source: Wikipedia)