Konosuba: An Explosion on This Wonderful World! Bonus Story, Vol. 1 (light novel)

The right magic words can stir a person's soul. For Megumin, those words are "vigilante justice." Join everyone's favorite one-trick wizard, as well as Iris the Headstrong, Cecily the Problematic, and Yunyun...as they get a taste of the righteous bandit lifestyle! "For the sake of justice, there's no line I won't cross! No criminal act I won't commit!"