Combatants Will Be Dispatched Vol. 4

A month has passed since the cease-fire, and Kisaragi has sent a mutant to get the invasion back on track. But their plans are derailed when Six is dispatched on a mission for water crystals that will relieve the kingdom of Grace from its drought, which he caused by changing the rain-making artifact's password to something that can't be printed. Is Six really the right man for the job...?