Kingdom is a manga about the end of the Warring States period in ancient China. In short, that part of history saw the reunification of China under the King of Qin, who went on to proclaim himself the First Emperor of China before proceeding with a series of brutal reforms that nonetheless shaped the whole of the history that followed. Regardless, Kingdom is centered around a fictional version of the general Li Xin, who played a pivotal role in Qin's unification campaigns but proceeded to retire following its ultimate victory. Kingdom has already had an anime series. However, it seems that it is popular enough that it will be getting a live-action series as well, which says a lot about its popularity.