Entertaining story? Hrm.....not really into sissification, but after playing Afterlife I'm kinda curious about how this can be handled and this seems to have decent art and reviews (although I have a feeling the sissification will be far more "aggressive" than Afterlife's exceptionally slow and not forced burn, seriously, criminally under liked game because its H-content is barely existent despite its superb world building)
If this is more story-centric and there's no forced M on M, I might give it a go just to see.
It isn't really much in the way of sissification but really girlification (i.e. there is no humiliation for the sake of humiliation, the protag is just a tad unlucky and magico monsters are generally mean, but human characters won't treat you like dirt for the hell of it).
Yes, the process is very slow and very detailed, with many different TFs for specific body parts and also mental feminisation options, in various combinations and from different sources. It's possible to also accept or reject those changes on a personal level and the MC reacts and talks accordingly. Intentionally getting TFs is also possible via siphoning energy from certain monster cores, and avoiding all TFs is just as possible too (bar one at the very start, but that can be undone in an ending if you have the right item).
Ero-content wise, no. This is absolutely not a fapgame, so people who are only interested in going from one sex scene to the next or lots of Battle Loss Rape/Game Over Rape won't really get a kick out of our game; the focus is very much story and character development w/ teh sexy thrown in.
There is no forced M on M either; one of the characters can be a futa (and you can tell her not to do that as she can shape-shift the dick away), and the protag can have sex as a guy or girl depending on TFs gained.