Located on the Yepetes Peninsula, the Kingdom of Hortancia is a great country that is proud of its 700-year history. The kingdom's fertile land is coveted by neighboring countries and has been threatened with invasion several times, but the two principalities serving the kingdom, the Principality of Olivia and the Principality of Comella, have become the kingdom's sword and shield, saving the kingdom from war for a long time. However, on December 5, 767 of the Holy King Calendar, the Principality of Comella suddenly raised the flag of rebellion against the Kingdom of Hortancia. The rebellion of the Principality of Comella and the monsters that appeared at the same time as the rebellion ushered in a chaotic era for the Kingdom of Hortancia... In a world of war, the knights are trapped in a tragic fate. Starting from the tragedy, the fateful inheritance and battle began.