Doomsday: If I Ask You to Forge a Sword, You Will Build a Mecha?

Monsters that overturn the world appear, and all high-powered weapons are ineffective. Only cold weapons can kill the monsters. In such a world... Perhaps only the strong can survive. Yu Wenheng's limbs are too slow to become a monster-killing warrior. But his thinking is faster than anyone else. In this age of mechanical technology, who says you have to be strong? The reason why human beings can become the masters of all things is that they know how to use tools! The mecha he created is more powerful than any strong man, and more like a monster than any monster!