※Kome

In a world where sword-wielding maids first emerged as a trend among the aristocracy, their extraordinary swordsmanship soon turned them into bodyguards and, later, defenders of crime-ridden cities. After being dismissed from the mansions where they served, many found a new reason to fight and joined forces to protect the people.

A mysterious giant creature flies in the upper stratosphere. Where it comes from and what it wants are unknown. Shinobi is a young girl chosen to board a military plane chartered to destroy this 'thing'. But Shinobi is not just another girl. Like a few rare children in the world, she possesses a unique power that allows her to make herself invisible. Only her mysterious teammate can see her when she uses her power...