http://www.youtube.com/watch?v=66JY7HRFpcE
THIS IS TOO SHORT OF A TRAILER FOR AN AWESOME MANGA/ANIME! JAPAN! WHY YOU BE TROLLING MAN?!?!?!?
Seriously though. Read the manga. ;3; It is a perfect magical girl story all with the Fate/Stay Night goodness and glory.
However, if there was a Ruby Saber X manga out in real life, I would also read it as a favorite. I mean, who could hate our favorite crime fighting magical girl? o3o