The story behind Zupapa is actually pretty interesting.
The game has been known about since 1994. I LITERALLY have actual phone recordings from a very popular neo retailer back then (the name of the store escapes me) who announced it on his answering machine as an upcoming game!
It is from Face and was developed - and completed - around the same time as Gururin. Why it never made it out I don't know. People have had pics of the game since then but no solid proto has ever surfaced. It seems Aruze has a recent trend of rereleasing old, forgotten games (NITD supposedly was one of them). But its good to see it finally making it out.