The Emperor's Sword!
While I'm waiting for GeGeGe to come to theatres, I'll have to make do with this movie...大帝の剣
This shows you a site that'll direct you to a teaser-trailer and a link to the homepage.
And this will give you a little info about the cast. I only know the movie is about an emperor's really long sword. I don't know if it's a metaphorical sword or not...