Just one ending. A fitting end for a story arc that is all about deceipt and manipulation. The player character really is just a useful pawn to the all powerful succubi. Plus it's kinda necessary for the whole story happening in the dreams to happen. Time loops and all that.
Will the sequel have one ending as well or will there be like multiple endings? Like for example finally breaking the time loop or are you saving that for when we (eventually) get a fourth game?