Magical Girl Special Ops Asuka Series by Makoto Fukami, Seigo Tokiya

Three years ago, alien invaders ravaged the Earthuntil they were defeated by a group of young women blessed with powers from a mysterious source. The girls went back to their normal lives after vanquishing the ghastly monsters, but that time of peace is about to end. The same malevolent creatures have resurfaced, which means it's time for the Magical Girl Special Ops force to head back to the battlefront and defend mankind!

Asuka wants to leave behind her past as one of the Magical Girls who saved the world, and live a normal high school life. Unfortunately, things are never easy for a retired hero. When a pair of sorcerous Russian mercenaries kidnap one of her classmates, Asuka is forced back into the fight. There's more to this kidnapping than meets the eye -- and it might just take some Magical Girl Spec-Ops to set things right.

After her friend's kidnapping, Asuka knows one thing for sure: She can't hide from the dangers of the world's magical underground. Japan's newest special operations unit is more than happy to bring her on board, and their first test isn't long in coming. In an age of magic and spirits, Earth's arms dealers jump at any opportunity to seize some arcane relics of their own -- even if the asking price is human lives. It's time to send in the right magical girl for the job.