Wait, is this just a thread about Adventure games overall now ?
In that case, I'll preface by saying Kotaro Uchikoshi(Writer and Game designer at Too Kyo) has kinda been an almost unequaled master of the genre since the Nonary Games (999, Virtue's Last Reward, Zero Time Dilemma) came out back on the DS or The Somnium Files series.
The guy one ups the conventional aspects of the branching story paths in multiple choices story games by making the branching path having a purpose to the story itself(and in different ways too). That comes in with of course, excellent character writings and fascinating exploration of pseudo-science/esoteric concepts.
It's truly out there.
Switch Friend Code : 3905-6122-2909