Combatants Will Be Dispatched!, Vol. 4 (manga)

A month has passed since the cease-fire with the Demon Army, and with theteleporter online, Kisaragi has sent a mutant to help this invasion get back ontrack. But their plans are derailed once again when Six is dispatched on adiplomatic mission to Toris for water crystals that will relieve the kingdom ofGrace from its terrible drought, a problem he caused in the first place bychanging the rain-making artifact's password to something that can't be printedon the back of a book. Is Six really the right man for the job...?