Konosuba: God's Blessing on This Wonderful World! Vol. 4 (manga)

With his subversion of the state charge cleared up, Kazuma and Aqua are living a life of laziness thanks to their hard-earned reward money. Not content to idle away their days, Darkness and Megumin come up with a plan to revitalize the two slackers by taking them on a vacation to Alcanretia, known for its water, hot springs, and...the Axis Cult's headquarters!?