Invaders of the Rokujouma!? Collector's Edition 5 (Light Novel)

Contains Volumes 12-14!
The evil magical girls are finally making their move to seize the mana pool in room 106, just like Yurika’s been saying all along! Koutarou crosses paths with an old enemy, and Maki is forced to decide whether to follow her duty or her heart.
After Theia receives a distressing message about her mother on Forthorthe, she’s forced to make what could be a life-changing choice. Nothing is simple, however, when it comes to galactic politics.
In a special collection of short stories: Shizuka learns how to live with the incredible power that’s been sleeping within her, Yurika tries to save herself with a video game redemption quest, and the truth about how Koutarou knows Elfaria is revealed.