Lord of Leviathan

A post-apocalyptic world, a strangely rebuilt civilization. The war is raging, and the vultures of power are hovering in the sky above the ruined continent. Natural disasters reappear, and the bell of destruction is about to ring. Marn, a survivor of an ancient civilization, wakes up before the crisis begins. ... "But tell me why my plug-in is this pair of living treasures?" Ma En held his forehead and looked at the two girls. "Oh no, sir! The newly arrived citizens have used Leviathan as a mine again!"