By the Grace of the Gods (Manga) 06

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!

In his past life on Earth, Ryoma worked himself to the bone as an employee of an exploitative company. Now, in Seilfall, the former office drone decides to start a business of his own?! 
 

A plot of land from a kind acquaintance, construction labor courtesy of his multitalented pack of slimes...and opening day is at hand! As it turns out, a little help from his friends—slimy and otherwise—goes a long way to making Ryoma's dream a reality!