haven't posted here in a while but here's a theory i haven't read about yet;
As much as i love all the rape/murder mystery theories, i thought of this. What if Mado was in a car accident and her whole world is a dream inside of her dream. what if SHE WAS IN THE HOSPITAL THE WHOLE TIME. then when she killed herself in the end, it's when her real body just died. i always thought that block world looked more like a school, but it could be a hospital. also, black and white are the dominant colors in most of her worlds. maybe she was rushed there before she lost consciousness and fell into a coma. i think that hat and scarf girl was probably someone that witnessed the accident, maybe it was her that brought mado there and then maybe she stayed there with her because she was worried and wanted to see her recover, sometimes staying there until she fell asleep (hospitals get cold!). hmmm...can't really think of anything else right now. :/