In the year 20XX, cities were suddenly flooded with demons in the form of monsters and spirits that suddenly appeared in the city, sparking an all-out Demon War. Even now, more than 30 years later, demons still roam the streets and harm humans wherever they go.

In the year 20XX, cities were suddenly flooded with demons in the form of monsters and spirits that suddenly appeared in the city, sparking an all-out Demon War. Even now, more than 30 years later, demons still roam the streets and harm humans wherever they go.