About the Invaders of Rokujouma Collected Edition Volume 10

After making the long trip home from Forthorthe, Koutarou finds himself thrust to the forefront of intergalactic negotiations. Has the real alien invasion just now begun? And what's with the strange voice Sanae keeps hearing? With the girls disappearing one by one into a mysterious light, can Koutarou figure out what's going on in time to save them, or even himself? With the bonds they've built over the years, what will he do when he finds himself alone again? Contains volumes 28-31.