If this game wouldn´t have that amount of free-shocking-rape porn the game would be a lot better. With that being said, the first ending (Fuminori alone in the sanitorium) its fine. The Humanity wins is the best ending to me, really good. The "True Ending" is also really good, showing the ending of a love who ended dooming humanity.
The game is completly overrated, but don´t get me wrong, it´s good enough and it´s short.