Use the above link to get it at this price with 10% off otherwise the price will be £5.99
Ignore the synopsis on WOWHD because it's garbage, it's actually this film:
I definitely recommend this film to anybody who is into Japanese/Asian cinema, the story is great and the film looks great in HD. This is also by far the cheapest price that I have seen so far for the blu ray version.
EDIT: Apologies, I've just noticed that this disc is Region A, sorry about that. Please make sure that your player is region free/compatible with it first.