RS - I think it's PC98 games, this CG is smallest, and the worst, such as /g/910025/73dd933044/ normal - like this. Dos game, old CG. R or limt editon - best version, I think they are win98 remake, such as /g/311705/ffebce785f/
Notice, because each copy have 3 or 4 story, R maybe not have the same story, such as V6 and V6R.