I Upgraded Like Crazy in the Black Tower

At the beginning of the 21st century, the earth mutated, and the towering black tower of tall pines suddenly descended into the sky. From that day on, the whole world fell into endless darkness, fear, and war swept across the world. A disaster struck, and all life on the earth entered the tower. At the same time, in order to make up for his regrets, the future time walker Shigure resolutely used his whole body to cut off the long river of time, just to go back to the past and save his family and friends. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.