“Avoid trouble at all costs, stay out of the spotlight, prioritize efficiency, and live an easygoing life!! For that, I’ll do whatever it takes—!!” Setsu is a low-ranked adventurer living in the rural town of Ragbalt. After dying from overwork at a black company where unpaid overtime and unreasonable demands were the norm, he is transported to another world and decides to live as an efficiency-obsessed adventurer. While everyone else hates the tedious job of exterminating slimes clogging up drainage pipes, Setsu happily dedicates himself to it, allowing him to live a carefree and comfortable life without attracting attention. However, his extraordinary skills eventually catch the eye of some truly formidable people—including the female swordswoman Lilia. Before long, the seemingly insignificant slime-cleaning adventurer finds himself attracting the intense attention of the strongest people around him!?