[3] It was developed by Nitroplus and was first released only in Japan in December 2003, it follows the story of a young student who suffers bizarre cognitive disorder-like symptoms that progress into constant horrific visual scenery that occurred after enduring a car accident that killed his entire family, sans himself.

Later, in 2013, American company JAST USA officially published an English localization using a revised version of the fan translation and also re-released hardcopies on DVD-ROM in 2020 for outlets such as J-List with a more modern VN engine.

[8] This westernized take was panned by critics for being unfaithful to the source material at best, and for avoiding and sanitizing the heavy and unsettling plot points touched on in the VN and not showing understanding of the original work at worst.

Due to a side effect of a head injury he sustains in the accident, and life-saving brain surgery, Fuminori develops a bizarre condition that permanently affects the way he perceives his environment.

People around him appear as hideous lumps of flesh and organs; spoken words sound like grunts and screeches, normal meals taste and smell awful, and his sense of touch is impaired.

One day, as he contemplates suicide during a hospital stay, he meets Saya, whom he sees as a lovely young girl dressed in white.

Fuminori grows increasingly cold and distant from his friends, notably expressing his disgust for Yoh after she confesses her romantic feelings for him.

Yoh's friend, Omi, enraged, enters Fuminori's home to confront him for his abrasiveness, and ends up getting murdered and eaten by Saya.

Fuminori decides to take care of the suspicious Koji, driving him to Ogai's mountain cabin and attempting to murder him by pushing him into a well.

Ryoko, hiding in Ogai's mountain cabin, finishes transcribing the research, learning all she can about Saya and her race before resigning herself to her fate of mutation.

He buys a single bullet for his revolver, that he keeps behind the mirror in his bathroom medicine cabinet, which he plans to use for suicide in case the day comes that he cannot continue living with the trauma or visions any longer.