By The Grace Of The Gods (manga) 10

Slime's up for one recently deceased middle-aged businessman When the gods reincarnate him in another world as a boy with magical powers, he discovers that magically tamed slime are an untapped natural resource

Troubles continue to plague Ryoma and his laundry business as shady customers and mystery assailants persist in targeting Ryoma. However, with the help from his friends at the Adventurers' guild and the Merchants' guild, the attacks are easily countered along with cold servings of strong punishments. With worries about the safety of his business and employees wrapped up, Ryoma heads to Renafe to open his first branch shop. New friends, a new shop and fresh adventures await in Renafe