This is a doujin game produced for sale at Japanese game shows. In order to get one, you needed to order the game in advance and then it could be picked up at the show. These were not available to the general public.
Ginga Gunyu Densetsu Ichi or "Reinhardt Joraku" (Reinhard takes the Capital) reproduces the Legend of the Galactic Heroes conflict using the "Sengoku Gunyuden" system. It is a campaign game with a map that stretches the galaxy. The game comes with an 8-piece 34"x 45" map, rules, two sheets of counters, and four tables/charts. You need to assemble the map and mount the counters.
Scenarios include “Twilight of the Gods” and “Mar-Adetta.”
There is also an expansion for the game called "Frontier Conquest." However, both can be played as stand-alone games.