There are nine knights in the empire. Under the leadership of the First Emperor, they fought in the north and south, and unified the continent after thirty years. However, in the seventh year after the unification, the nine knights died one after another. The rule of the empire began to shake, and people were panicked for a while. At this time, the First Emperor began to recruit knights from all over the country to select a new generation of nine knights. The nine strongest people who survived the hellish trial would be awarded supreme power and money and become the nine knights. However, no one of the nine knights in the past could survive more than seven years. Because his mother and sister were seriously ill, young Mikas participated in the knight selection with the determination to die. After going through a mountain of corpses and a sea of blood, he was selected as the weakest Hollow Knight among the nine knights. But on the day of the award ceremony, he saw the memories of the Hollow Knights of all generations through the Holy Sword of the Hollow Knight, and saw the secrets of the empire. He finally understood why no one of the nine knights could live beyond 7 years...
