BIG MAN JAPAN (originally released as Dai-Nihonjin in Japan in 2007) is due for a late September 2011 release on DVD in UK, finally.
Here's a plot summary from IMDB:
An eccentric man aged about 40 lives alone in a decrepit house in Tokyo. He periodically transforms into a giant, about 30 meters tall, and defends Japan by battling similarly sized monsters that turn up and destroy buildings.
