Modern-day man Cheng Yan meets an untimely death and is reincarnated as Roland, the fourth prince of the Kingdom of Graycastle—a land that resembles medieval Europe. After saving the witch Anna from being executed, Roland learns that magic is real in this fantastical world.
Impressed by Anna's magical abilities, Roland dreams of using magic as a substitute for modern technology, launching a plan to build a "magical industry." Despite the deep-seated hatred of witches, he starts gathering these outcasts, employing their powers to develop Border Town and enhance the living conditions of its residents.
In addition to using magic for industrial growth, Roland introduces contemporary business methods to Border Town. He oversees the manufacturing of firearms, which earns him the loyalty of the local people. As more witches join his cause, the magical industry thrives, though Roland faces opposition from powerful noble families and rival members of the royal family.
With each success, Roland strives to create a peaceful coexistence between witches and ordinary citizens, extending his authority across the western regions of Graycastle and eventually the entire kingdom, all while uncovering the secrets of the demon race and the Witch Empire.