From Tokyopop:
Rune Ayanokouji lives a life less ordinary with a "mad" scientist for a grandfather and mysterious humanoid robots popping up around town. It turns out there's an alien plot to take over the world, but there seems to be a set of aliens with a different agenda in mind. With a little unexpected help, Rune and her friends are able to fight these aliens on equal ground. But with the fate of Earth at stake, who can Rune really trust?