LOL HI NEWFAG WITH THEORIES HERE
I've never actually played the game myself because it'd scare my pants off of me (12-year-old girls with sleeping disorders are NOT meant to play High Octane Nightmare Fuel games) and because my dad would kill me if he saw I'd downloaded something without his consent. I can't exactly say "HI I WANT TO PLAY A SCARY, BLOODY GAME POSSIBLY BASED ON RAPE AND FULL OF MULTICOLORED POLERUBBING PENISES."
Aaanyway, I've still done my fair share of research, so...theory time.
THEORY ONE: BOREDOM
Madotsuki has become utterly bored with life.
Even at such a young age (maybe), she's a child genius with an interest in psychology who feels the world has nothing left for her. So, she teaches herself to lucid dream, locks the apartment to keep everything else away, not to keep herself in and sets off exploring. Also explains her almost complete lack of emotion - it's all too predictable for her.
And her suicide? She'd fully explored her dreams and felt there was nothing left for them to offer her.
THEORY TWO: TEH INTRNETSE
Madotsuki is an Anonymous user on Uboachan who has locked herself away from the outside world, because everyone else is a n00b. Meanwhile she gets some pretty damn trippy dreams...does this mean there's an endless chain of Madotsukis..?!
THEORY THREE: KYUKYU-KUN/CHAN/WHATEVER IS MADOTSUKI'S MOTHER
Poledancer, anyone? Hmmmm?
(Sorry for any misspellings or grammar mistakees - writing this on a DSi hurr :B)