Invaders of the Rokujouma!? Collector's Edition 10

Contains Volumes 28-31!
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?
It's the start of a new school year at Harukaze High. Fresh faces abound, and there's one girl in particular who really seems to get Koutarou's attention. She looks so familiar, but no one seems to recognize her. Just who could she be?