Yuji Sano was a normal guy working a soul-sucking nine-to-five job when he suddenly found himself transported to a fantasy world where he restarted his life as a Monster Tamer. After befriending the Slimes, Yuji is quickly able to gain a second character class, ranking up his stats and learning new skills as he encounters one surprise after another.

Mother Earth's Tears, the rare material used for agriculture, is located on a dangerous island, but Yuji joins a party of veterans on a quest to collect it. They gather so much of it that they can't carry it all, but they can once Yuji places it in his Slime Storage, much to the veteran adventurers' surprise!