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.

Yuji begins looking into a brand-new type of threat that lurks on Evildominus Island, a dangerous place renown for the precious resource, Mother Earth's Tears. Yuji and his team of tamed monsters are able to secure several specimens using a combination of ice magic and unlimited Slime storage. As they continue their search, they stumble on an unexpected surprise deep within the island...