Protagonist is the only witness of the incident and his fate depends on his memories.
While wandering throug.The Butterfly Sign: Human Error is the second chapter of the first person detective video game in which we are playing as a sole survivor of a serious terrorist attack.. That's why he goes in for a desperate measure: he takes the experimental medication called "Rammex", which immerses him in the depths of his mind and makes him accurately recollect a chain of events, which had happened.