Ultra: the Struggle of the Galaxy

In this fantasy world, death and destruction are only fleeting things. The peaceful world is almost shattered by the emergence of demons, and I am just a mortal who wants to survive in this world. I have no merits. What am I? Why did the light choose me? Why should I fight? Why did they choose me? I just want to live... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.