I was looking forward to this flick since the main character was played by Ando Masanobu, who made an impressive job and performance as "Kiriyama Kazuo" in Fukasaku Kinji's now to be considered cult film "Battle Royale" which was just shot the year before "Red Shadow".
The movie itself is not the typical ninja flick, so anyone running to the box office with this piece in mind looking for raw violence and beautiful fighting scenes and such probably will get disappointed. Instead, the flick is spiced up with a humorous approach to things and there is more weight put upon comedy and love than on ninja stunts (and those stunts that are, are quite silly to be honest - but that's how they were meant as well, I'd say!). I thought the story development at times was a little bit weird but I hopefully ended up with figuring it all out. Ando makes a neat performance, although not near as good as in "BR" but this role is quite different, too, and perhaps that has an take on things, too.
6/10 for this Toei production, an OK piece of entertainment a Sunday evening.