I want this DVD, but I can't figure out if it's legit or not... Seems kinda odd that it has Japanese packaging, especially since it has a Cantonese dub, but this may be a common thing for Japanese films in Hong Kong. Amazon China does not seem to carry any of the versions, and I couldn't find a website for the publisher, but it is mentioned on some anime websites. Someone selling it on Yahoo auctions also guarantees it is legit. "It is licensed from a major dealer in Hong Kong that has approval to sell the product."
As for a subbed copy, I found one and am trying to extract the burned subtitles using SubRip (which requires an awful lot of patience to learn how to use).