Apparently it's just a fan work circulating on the Internet, mainly Youtube. But praise to those people behind the work, the camera work and special effects are quite professional, and the acting is quite cool as well, complete with make-up and costume some more. They even have their own giant robot! Certainly something above average for home-made videos.
Even the Japanese seems to welcome it's appearance :D
If you can't see the video, follow this link to Youtube.