Aha! I watched this a couple of days ago and spent ages trying to find out what the movie is.... and I've finally found out!
http://www.imdb.com/title/tt0217679/ http://www.mandiapple.com/snowblood/nakedblood.htm
It made me laugh as one of the recommended imdb movies was Koroshiya 1... (ichi the killer)... one of the dvd's I already own >.<
H.