My Isekai Life: I Gained a Second Character Class and Became the Strongest Sage in the World! manga volume 6 features story by Shinkoshoto with art by Huuka Kazabana and Ponjea.

Yuji travels to a town known for its monster-enhancing armor, Boginia. Yuji, the slimes, and Proud Wolf end up currying the favor of the staunch old proprietor of the best shop in town. In order to obtain the items to craft the monster armor, Yuji must go out and hunt the dragons dwelling in a volcano. As new types of slimes join his crew, an even more powerful dragon shows up...?!