So, quick question: Is the Steam version a new release with exclusive content or it is the same game?
It is the original game by Inusuku that has been on this thread forum for a while, but with Kagura's translations (maybe) and the official uncensored pics. It is fully updated to the current Japanese version, and no, the DLC will not be in English yet, and will overwrite the English translations if it is installed onto the Kagura version once it is released later on.
Ah, and no save carry overs because the 'title' of the game in the code is different. Technically, if one simply changed the title back to the Japanese one in WolfRPG Editor, it would cause all the Japanese saves to work fine.