Chaos;Head

Chaos;Head is a visual novel in which the player takes the role of Takumi Nishijo, an otaku and borderline shut-in, who experiences delusions. The game is mostly linear, but the player is able to choose whether Takumi should experience a positive delusion, a negative one, or if he should manage to stay grounded in reality. Positive delusions involve seeing comical or erotic scenes, while negative ones include graphic violence or other horror elements. (wikipedia.org).