The Rolling Girls

10 years after the Great Tokyo War, each prefectures in Japan had split up into independent nations. Each nations are ruled by a prophet called "Mosa" and an army called "Mob" as they start to compete to take over other countries. Four "Mob" girls from the Saitama clan, Nozomi, Yukina, Ai, Chiaya are ordered by their “Mosa” to travel around Japan riding their motor cycles to mediate multiple battles between nations and clans as they emerge.

Synopsis from Anime News Network