The times of legends, when humans and gods shared the same world, are long gone, spanning millions of years. During those times, the driving force behind the world's movements were the aspirations of mankind. The era known as the 500 year war, or the Era of Warring States, was characterized by this. Kingdom tells the tale of a youthful individual who blossomed into a renowned commander and the tumultuous challenges and violent incidents that accompanied his rise.