http://www.tsukuru.info/tlwiki/index.ph ... aya_no_Uta
description taken from vndb.org:
Fuminori Sakisaka has a traffic accident which kills his parents and leaves him heavily injured. When he has a brain surgery to save his life, his perception of the world changes: everything he sees becomes blood and guts, people's looks and voices seem like monsters, and food that normally appeals to him tastes disgusting.
As he contemplates suicide in the hospital, Fuminori meets a beautiful girl among the flesh-covered walls. She introduces herself as Saya, and is apparently looking for her father. Fuminori does not want to be separated from Saya, and asks her to live with him. She agrees.
This game is definitely NOT for the faint of heart.
going through a variety of gore, this game also contains rape and concepts like cannibalism.
But other than that, this game is really really good. I found myself captured, playing the game for hours straight. I even found myself debating whether or not i should call in sick for work so that i could finish it early. With the main female character going through her bits as a psycho loli, the story goes through the mental breakdown of characters with almost everyone being or going crazy. The story is deep and very very dark, but through it all, this game is a love story between, Fuminori, who looses his humanity, and Saya, who gains hers.
Definitely recommend this if your into this kind of thing.