Become a true world destroyer in the Wind City, and in the battlefield where the old and the new are connected, cheers, knight! Tear down the gate and backstab the old man Sonosaki, so that this planet will not be underestimated by anyone. In the lost heaven, become the great villain, and face the dead who have turned the world upside down. In the lost world of knights, become the last hope and protect the glory of knights' history! In the era of artificial intelligence, in the face of the deepest malice, in the face of the powerful darkness that envelops the world, a miracle is born! When the existence of all knights is erased, the memories buried in time and space become the bond that connects the knights, the bond is forged by the bond between people and knights, when the world still needs knights, they will eventually come back from the memories and let people watch their transformation. Xiao Long, an ordinary person, carries the fate of people and walks on the fateful road of battle.