By the Grace of the Gods Manga Volume 3

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! After Ryoma registers with an Adventurers' Guild, his first challenge is protecting a town from an epidemic. Will his modern-day Earth knowledge and advanced slime skills be enough to halt a plague?