Imagine a world where your deepest traumas and mental ailments took physical shape, that is the world of LUNAR STRAIN. In a time where every human's despair is rooted in demonic possession, our protagonist Mari begins her journey to become a "Therapist", a job that is not truly what it seems. In LUNAR STRAIN, these "Therapist" are comprised of a secret organization of Shamans who exorcise these demons on the day to day without the general populous' knowledge.