Kamitachi ni Hirowareta Otoko
. Wait for ch 32 Ch 31 main does a preopening with his friend and other guild leaders who main is friendly with to show how his shop operates Ch 7 main gets kind of adopted to the duke's family bc they are in awe of his skills and knowledge, they want him to come back into society to show his talents. They sign him up at the adventure guild but the master there tells main that slime familiars are the lowest familiar to tame, so society only sees powerful familiars as a sign of high status in rank. Guild master worries that main can't go up in rank with just his slimes, but duke's family knows what main is capable of and still encourages main to do quests to go up in rank Ch 15 main shows alchemy of separating iron molecules and create a whole iron bar. But bc this world doesn't understand molecular science, of course the other worlder could not explain alchemy as well and so ppl thought alchemy is a sham and scamming ppl. Well of course bc the person was kind of scummy and misused it while not explaining how he did it. So main shows the right way without scamming Ch 16-17 main was able to sell his inventions via help with the Duke family with a merchant so they can sell the 100% pure iron exported to legally sell instead of ppl suspecting he used alchemy by they frown upon alchemy by it is associated with conning ppl if used that way Ch 18 main joins an adventuring event that go hunting and get observed to be qualified to go up a rank Ch 22 main helps with his slimes at a goblin raid and ppl appreciates his slimes Ch 26 main going to open a laundromat and for cheap clean the grime that's hard to clean with his slime. He manages to build his shop by ch 28
Tensei Kenja no Isekai Raifu ~Daini no Shokugyo wo Ete, Sekai Saikyou ni Narimashita~