The world was destroyed. A world filled with death and despair. The one who fought with a sword until the end — Sword God. Karselian Le Vandeyan. However, as if by fate, the door to another world opened, and this time… It was the Earth that had not been destroyed. There, monsters slowly appeared, and people were still living without knowing how great this disaster was. This world had not yet been destroyed. However, the moment they let their guard down, that terrible nightmare from the past would repeat itself. To prevent that Sword God takes up his sword again. He borrows the body of a weak human from the past and begins a new life. In exchange for taking over the body, he makes one promise. “I will protect your family.” And now, the real beginning.

(Source: KakaoPage, translated)