As a person with this kind of fetish, this game is godlike, very well crafted from scenarios and visuals, to it's theme and good sound effect implementation, it ticks all the boxes for me.
As far as I remember from following the games development it's getting a remake to make all the models 2D illustrated art, which could be interesting, we'll have to see. The game was uploaded on DLSite and taken down not long after (I think only a day later) and never re-uploaded, I've heard people say it was because it was buggy, but someone patched it and that's how we're able to play it.
If anyone want's my Save file I'll leave it here, I remember becoming obsessed with it a few months ago putting over 17 hours into it (I know, it's kinda long), and I'm still missing a couple scenes because I had a lot of trouble with the Japanese only text, but through the power of Trial and Error (and a little research) I was able to get most of the scenes. I have all the Ghost powers (God, I hate that ghost part) so that should really help out those looking for the last couple of scenes, it can be a difficult game to understand, should be easier now that it's (somewhat) translated.
I hope we get to see more games similar to this in the future for us "toilet fetishists", a lot of care and attention (and I dare even say heart) went into making this.