Combatants Will Be Dispatched!, Vol. 5 (manga)

Agent Six's squad, having failed to get their hands on the water fruit, are
stuck
wandering in the desert. It's looking bad-they're
running out of water, their reason is
boiling away, their survival instincts
are running out of control, and their useless
necromancer is shriveling away.
In the face of all that, can Six and the rest really make
it back from the
desert alive...?!