My Room is a Dungeon Rest Stop (Manga) Vol. 7

A stroke of inspiration in the mortal world has Touru and the others rushing back to the dungeon with a hot idea for rebuilding the Thieves' Guild's district. They want to plan a festival! Inspired by the summer festivals of Japan, Touru thinks a dungeon festival will be great advertisement for the Thieves' Guild. But in order to have authentic stalls, the adventurers need to go hunting--for rainbowfish! To make goldfish scoop special, it's time for one last adventure through the dungeon!