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 him. However, with the help from his friends at the Adventurer's Guild and the Merchant's Guild, the attacks are easily countered. 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!