Konosuba: An Explosion on This Wonderful World!, Vol. 4 (manga)

Leaving Arcanletia and the Axis Church behind, Megumin and Yunyun hop on a wagon bound for Axel, where Megumin's role model awaits. It's going to be an even rougher ride than they expected, however, when monsters assault them at every turn! Is this just bad luck, or is there something more sinister at play...?