Jubai and Kagero find that their individual purposes and paths are inextricably intertwined not only with each other's but also with that of Dakuan, an elderly Tokugawa spy. They will have to overcome not only their antipathy, if not outright animosity, towards one another, but also the formidable enemies they will come up against if they are to survive.
The Blu-ray edition of Ninja Scroll (which has a 4:3 aspect ratio) has drop-dead vibrant colors, lovely artwork and imaginative action animation. There are three audio tracks to choose from. There's an English audio version, and a Japanese one with easy on the eyes yellow English subtitles. Finally there's a commentary audio track with director Yoshiaki Kawajiri and animation director & character designer Yutaka Minowa that is moderated by writer Hiroyuki Ohnuma. It has English subtitles in yellow and white lettering that makes it easy to follow what each person is saying. Needless to say, these audio options make for three distinct ways to experience the film, each worth repeated viewings.
While I imagine that the regular DVD version is fine, I don't think sensible fan would regret laying out a few more dollars for the Blu-ray version. It's stunning.