This System Is Awesome

In this world, magic reigns supreme, which is different from Earth. Demons and monsters are in chaos here. Since ancient times, humans have opened up a new path of magicians in order to survive. After two world wars, people and magicians all over the world have defeated the demons' attacks, and humans have ushered in a brief period of peace. However, the good times did not last long! Who I am? Where am I? What am I doing? Overnight, I, I just had a dream and traveled through time? Time travel is time travel, but this system is a bit... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.