Grimgar of Fantasy and Ash (Light Novel) Vol. 5: Hear Me Out, and Try Not to Laugh

...So, this thing, what do you think it is? It has now been some months since the party came to the Wonder Hole. Haruhiro and his companions have been slowly but steadily improving their skills as they clear the labyrinth. One day, while exploring, they find a hole they've never seen before. A hole that, as far as they know... wasn't there when they passed through the area three days earlier. It may lead to a new and unexplored area, which would be highly profitable for them if they are the first to set foot in it. Haruhiro is hesitant on whether to go inside or not, but Team Tokimune, a group known for being full of eccentrics, but still highly capable, appear and propose exploring it together. The tale of adventure born from the ashes continues with new encounters.