That's Ys 1 silly. Dempa's own remake, which is not a bootleg. 
To clarify...
Ys 1 was released by Dempa in 1991. This is an official remake of Ys 1.
Ys 3 was released by Falcom in 1990. This is an official release.
Ys 1 (a port of the PC-8801 version) was unofficially and illegally released by some doods known as Team Milkhouse. They did the same thing with Ys 2.
Illegal Ys 1

Illegal Ys 2

Ys 1 and Ys 3 for X68000

Ahh Ok,I never bothered to play it much. He had the images in a file folder listed as y's2. When I loaded it up I only looked at it for a sec,I assumed he was correct because the graphics had a rework that looked alot like the Falcom Classics Y's2 collection for Saturn,which I had way back in 2000,so I assumed it was the same game. So I am guessing then the Saturn version was a total rework on its own too then? I play very little of Y's,I thought the series looked nice from afar,but I don't like bum rushing enemies. The only one I played the most was Y's 1 for Master System. When I had 1/2 for Turbo Cd,I played it for like 3 mins,that was it. I did beat Ys 3 for Genesis though,way before I ever even knew what systems Ys 1,2,ect.. were released on in any format.