Well, it is a rar image, so I first thought it was a MODE1/2352.
I tried to convert it to MODE1/2048 iso, but all I got was an unworkng iso, that was smaller or bigger (don't remember) than the raw.
So next I made Fireburner assume it was a MODE2/2352 raw, and convert it to a MODE2/2352 iso or something, and that time the size was right and it worked. Maybe Fireburner is the wrong program?
The game is 3x3 eyes, so it should be sega cd alright 🙂