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Mirai, a psychiatrist, enters the mental world of patients and uses the Neutron Community System, a machine that treats patients by eradicating their nightmares, and acts as a righteous heroine called Spirit Guardian, an evil secret that instills nightmares in people's minds. I was fighting with the association succubus. One day, Mirai's patient, Masahiko's mind, begins to malfunction. Mirai enters Masahiko's spiritual world in order to exterminate the nightmare that eats into Masahiko's spirit, but it turns out that what controls Masahiko's spirit is a monster far beyond her imagination. Will Mirai be able to save Masahiko's spirit? [BAD END]