If you're looking for manga similar to Sweet Valerian, you might like these titles.
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.
Amu's beloved Guardians Characters finally nab the spotlight in this new Shugo Chara series! Ran, Miki, and Su explore holidays, exercise, bears, cooking, painting, and more character changes than you can count in these hilarious and lighthearted short stories, told in the vertical 4-koma (4-panel) comic strip format.