Kairo Ashen was a normal highschool boy, but then got transported to a mysterious world. And what awaited him was robed figure who were seeking a hero. But Kairo didn't know how to use magic or had any powers... or so he thought. So, the robed figure kicked him out and dubbed him "Kairo Ashenfall". And, it wasn't till after he was outcasted that he was the most powerful person on that world.

Kairo Ashenfall was born in a world that Magic Is everything, your rank, who you are, etc. And he was born with unlimited magic powers. That's challenged everything.