I've Been Killing Slimes for 300 Years and Maxed Out My Level Novel Volume 10 is written by Kisetsu Morita with illustrations by Benio.

I’ve been killing slimes for three hundred years-and now Falfa wants us to sell sweets at a festival? She’s a little too excited about this-but I can’t say no to someone so cute. This time, we met a singing fortuneteller, and went on an adventure with a certain girl who loves white. (The Return of Azuzard!) And maybe, just maybe, Flatorte will learn to be good…