Anónimo

On orders from Mithril, Sousuke has been forced to abandon Kaname to focus on learning the secrets of the Arbalest and the lambda driver.

With the defeat of Gauron, Sousuke's life has entered a comfortable rhythm. He's adjusting to school—the occasional car bomb false alarm notwithstanding—and balancing his newly-found normalcy with the needs of his mercenary life. He's even started to turn his thoughts toward the future—a future that might involve Kaname. But that future will soon face a threat, not from North Korean soldiers, Italian mobsters, or Russian Spetsnaz... but from the hierarchy of Mithril itself!

Kaname is in the doldrums: There's just one week until the end of summer vacation, and she hasn't done anything interesting! Fortunately, Sousuke is here to provide a little adventure by offering her a trip to Merida Island. But what starts for Kaname as a simple trip to learn more about the mystery surrounding her quickly snowballs into a firefight in a chemical weapons facility, a reunion with a mortal enemy, and a battle for control of a runaway submarine! However things turn out, at least she can't claim that her summer was uneventful.

Two months after Sunan, Sousuke and Kaname are in a holding pattern. He'll fire his rifle off the school roof. She'll yell at him to stop. Lather, rinse, repeat. That all changes one day when Sousuke's commanding officer Teletha "Tessa" Testarossa shows up at his apartment, trying to hide a key to a terrorist superweapon of unprecedented power. Tessa is brilliant, pretty, and the same age as Sousuke, and her presence might put a serious crimp on his relationship with Kaname... assuming the city survives the night!

Sagara Sousuke isn't your typical high school student. He reads military enthusiast magazines; he responds to questions with "affirmative;" he brings grenades to school in his bag. Though everyone at school takes him for a hopeless military geek, Chidori Kaname thinks there might be something more to him. When their plane is hijacked in the middle of a field trip, Kaname's instincts will prove correct: Sousuke is an elite, mech-piloting mercenary... and he's here to protect her!