Rip of the 1985 promotional picture disc release from Mitsui Water Theater.
This release appears to have been a part of the Tsukuba EXPO '85, for which an excellent album by Andrew Thomas Wilson was also produced (/watch?v=qLxY1BXEtyE).
Apologies for the sound quality, even after cleaning up a lot of the quieter sections the rip turned out quite noisy.