There is a history in this world of multiple battles with the demon race for survival. Although the Demon King was sealed away by the third generation of heroes, the entire continent is still a cutthroat and brutal land. Traveling through such a world is the unsympathetic wizard, Johan. Johan, the wizard, is a man who keeps his public and private affairs separate. However, he occasionally lets his emotions run wild. His hobbies include killing bandits and thugs. Also, lecturing people and picking fights. In this dark fantasy, Johan, who lives in the current era, travels through a world that has been ravaged by multiple major battles with the demon race. ※ This work is also published on Kakuyomu and Hameln. There is a heroine, but no harem. There is no shortage of depictions of violence.