Konosuba: God's Blessing on This Wonderful World!, Vol. 7 (light novel)

Still sitting pretty on the reward money from defeating several of the Demon King's generals, Kazuma is taking it easy. Darkness, on the other hand, is nowhere to be found. Just as rumors about Darkness leaving to marry a lord begin to circulate, a letter turns up.
"I can't see you anymore. Please accept my resignation from the party."
Is this the beginning of the end for everyone's favorite band of misfit adventurers?!