During the Warring States period in China, Li Xin and Piao were two young orphaned slaves who dreamt of becoming Great Generals despite their low status. They met a nobleman who gave Piao an opportunity to serve within the royal palace of Qin. Although they parted ways, they promised each other to become the greatest generals in the world. However, after a coup d'état occurred in the palace, Xin encountered a dying Piao whose last words spurred him into action. This led him to meet Ying Zheng, the young and soon-to-be king of Qin. Initially on bad terms, they became comrades and embarked on a journey filled with trials and bloodshed. Their goal was to unite all the warring states under Qin, and Xin aimed to climb to the top of the army ranks. Amidst constant tactical battles between states and great political upheaval both inside and outside the palace, they worked towards their monumental ambitions that would change history forever.
In 2013, Kingdom was awarded the 17th Annual Tezuka Osamu Cultural Grand Prize. As of April 2017, the series has sold 30 million copies.On December 12, 2012 the series won a Guinness World Record for manga written by the most people. The record was made possible due to its "Social Kingdom" Campaign where artists, fans, and voice actors redrew the entire 26th volume. Each of them picked 1 frame and redrew it and the top 100 would be given a special edition of the manga. Eiichiro Oda (One Piece), Masashi Kishimoto (Naruto), Hirohiko Araki (JoJo no Kimyou na Bouken) and many others were among the participants.