It crashes in Yuki's part.
I managed to get it working though.
Now the review:
Visual novel is good, very good thing.
The gameplay - disabled, this is visual novel.
You should add a warning though, some people don't understand this type of art.
The story - The story was neat, though some things weren't explained - like who organises this world, does it have any superiors? How do they know they are supposed to be in group with each other?
The music - fitting, quite neat.
The visuals - Now that is it. They are rather weak. Seriously. You should work more on this.
What you did was taking some images, making low-quality animelike portraits and just combined them over and over again. I'm not asking you to make full-length 3D movies, but please try to make more images to use. What I really disliked was that some of the "pasts" hadn't any visual and some did. Basically, it's supposed to be a visual novel, not a text novel. The actions happening in < > should have corresponding pictures of them, at least. I would love to see you improve.
What are character models?
I could maybe help in some way.
Typo - in some moment in Yuki's ending, there is "hoji" instead of "Shoji"