Guns, Steel, Witcher

A desperate world, terrifying creatures, they come from the sores of the world, hungry for flesh and blood. The sword and shield of the demon hunter guard the world with difficulty. The soul of a mechanical engineer named Lorraine traveled here, so in an inconspicuous town, with the help of the ability of the cursed girls, a city of steel and industry began to be built. The truth of this world was gradually discovered, the disappearing star of God, the strange giant plant known as the eldest son, the brain monster with tentacles, and the truth about the sore of the world...