Yes, as the post N°246 said, the author recently said that he was working on a new project, but that he would not rule out the idea of adding new material for this game, based on this, we could expect a DLC within 1- 2 years, it can even be ≤ 2 years but it is what generally it takes developers to do the molding of the scenarios, the illustrations, adjust the soundtrack, etc.
In fact, on the DLsite page, they are asked to add the gallery and scenes of lesbian sex. You also forgot to mention that the author is thinking of opening a page in Ci-en to show all the progress of the new game.
I have been joining the platform for about 1 year, and I always look for games where we are given the choice of whether to corrupt our MC or go the "pacifist route", I clarify that there are very few games that have this mechanics, some of them are necessary the H events to continue with the linear history.