Yes indeed.
I wonder if it ever got finished or had any outings?
I suspect not, otherwise it would be better-known.
There is speculation that it was designed by Albrecht Goertz but that might be because he was rumoured to be busy designing the 240Z at that time, though in actual fact he didn't design what we know of as the 240Z but he was involved in some work for Nissan..
More information welcome! Pity (and surprising) we don't have any Japanese members.