The Crowned Gardener's Chronicle

Hasumi, the Princess of the Northern Empire runs away from her duties as a princess and heir for the throne along with a servant boy, Shuihan. They travel the world which is divided into four empires and end up solving mysteries and problems around the world while Hasumi fulfils her interests by learning about more plants. But the mysteries began to conspire and they get stuck in more rigid situations. They manage to escape, barely. When her blood is royal, certain problems arise.