Mio

This is a world of magic. 20 years ago a magic tower emerged out of nowhere changing the world forever. Inside that tower, which's connected to every part of the world, are endless dungeons filled with monsters of all difficulty levels from Rank E to SSS, ready to be challenged. With the emergence of the tower rose the population of magic wielding humans classified from E to unrankable named Rankers. There are 5 S-class Rankers so far with one of them being your best friend Kian. You're who ever you want to be. However, your name is Mio (be a human, a ranker, a demon or god whatever)