The world was destroyed. A land consumed by death and despair. And in the midst of it all, one man fought to the bitter end—the Sword God, Karselian Le Vandayan. But then, as if guided by fate, a door to another world opened. This time... it was Earth—a world that hadn’t yet collapsed. There, monsters have begun to quietly emerge, while humanity lives on, blissfully unaware of the impending catastrophe. This world hasn’t ended... But the moment they let their guard down, the nightmare will begin anew. To stop it, the Sword God raises his blade once more. He begins a new life, borrowing the body of a once-weak human. And in exchange for taking over that body, he makes a single promise: “I’ll protect your family.” And now, the real battle begins.