Reborn as Shin's brother:Kenja No Mago

This novel is actually on Wise man grandchild or Kenja no mago. It going to be a self inserted character who is going to be born at the same age as Shin in the original anime not only at the same age but actually as his twin brother who is very highly proficient at body enhancing magic because of his past experience as a martial artist. Although his journey will be tough but it's still something that will help him progress.