I could be wrong, but isn't this giving off eminence in the shadows vibes?
Sort of... But Eminence is based off Chuuni and Chuuni materialising as "reality" through "happenstance".
This is more a brother-sister team-up to Fix the Ails of the World, with each at different ends.
Honestly... This is one of a pretty large array of current LN's/Manga milking the dregs of the reïncarnation/Isekai fantasy theme by using DnD encounter tables...
"OK..we need a basic premise..."
"Roll 3 D6 and check the Isekai Trope table..."
"Ummm.... Noble Son gets kicked out"
"OK.. now roll 4 D4, and check the Cause Table..."
"ummm... Overpowered "Useless Skill."
Ok... Realm? umm...2 D8, main Power Table, 2 D6 for Gimmick.."
"ummm Sage Arts , and....Hermit."
"OK.... protag? Male. Sidekick? Semi-harem. aaaanddd.. -dere Imouto, ...brocon.. Antagonist? Umm.. Basic Villain... aaannndd.. oh damn! recurring... "
"
Sigh Dammit! Shounen then.. so hoped we could do a Seinen this time and get a bit creative... Ah well, thank you Editor-sama..."