In Another World with My Smartphone, Vol. 4 (manga)

After Touya declines a noble title for his service to the king, he receives a hefty sum of gold and amansion all to himself instead! But before he andthe girls can settle into their new home, they’ve got a new quest with international implications! They’ll have to open up a gate to Mismede-a deceptively simple task that doesn’t take long to go awry…