Kami-tachi ni Hirowareta Otoko 2nd Season EP1 - Ryoma and the New Plan

After a small incident in his store involving a couple of unruly customers, Ryoma decides to create reinforced glass in the mines. It's also there that Ryoma discovered the evolved form of a Poison Slime called the Medicine Slime. He would later also meet a new god that had taken a liking to him named Tekun.