Louise of the Void
The enemy is starting attack villages and another solar eclipse is about to happen. The empire has formed an army with Louise and Guiche to avert the attack. Saito finds out and uses the plane to come to their aid, but he has to give up his chance to return home. He was able to use the machine gun to eliminate most of the enemy, but ran out of ammo and couldn't take down Wardes. Louise unlocks her magic, destroying the entire enemy force. After the battle, the solar eclipse is over and the plane is nearly destroyed. Saito ends up staying.
Aired 25/09/2006EP 13 - Louise of the Void

The Familiar of Zero
Louise is a magician at the Tristein Academy, dubbed with the nickname "Zero Louise" due to her inability to effectively use her magic properly, resulting in zero successes. An upcoming test at her academy requires her to summon a familiar, a servant and partner to support her as a magician. Despite desiring a familiar that would be superior to her constantly mocking classmates, Louise ends up summoning Hiraga Saito, your average Japanese boy. Even with Louise and Saito both unwilling to accept each other, they have no choice. Louise cannot attempt another summoning and Saito cannot return to Japan, and so their life together begins. Based on the novel by Noboru Yamaguchi.