By the Grace of the Gods (Manga) 12

Gimul will soon be celebrating its founding with a festival, and Ryoma decides to participate by opening a food stand with his Bamboo Forest workers. They'll be serving some special dishes from the varied hometowns of Ryoma's employees. As excitement builds up for the festival, a potential problem arises when giant ants threaten the road to Gimul. In response, Ryoma takes a job with the Tamer's Guild and deploys his army of birds and slimes to search and destroy the dangerous ants!

Volume 12 of the By the Grace of the Gods manga series by Ranran.