In this history you will be reincarnated into another world as a noble kid but because of a error of the reincarnation god you recover your previous memories, in this new world is the medieval era the magic and monsters exist everyone has a level and stat ranks when born this ranks orders is F, D, C, B, A, S "F" as the lowest one and "S" as the higest one this rank defines the ability fo fighting using magic and more for level up you will have to go to dungeons and defeat monsters to level up