The man who can singlehandedly broke the stalemate of the war was called "The Empire's Strongest Magician".

Mowing down his enemies with tremendous magical power, as if a "demon" incarnate, an existence feared by his own allies.

[— — Why do I look like this?!?]

For some reason the man's appearance was that of a young dark elf girl.

Even though [God] granted him the strongest magical power and the ability to read people's minds, God thought that was boring, so the man was reincarnated as a girl.

This is the chronicles of a perfect corporate slave becoming a dark elf and the process in which he climbs his way up in a parallel world.