Lux-Pain is an adventure visual novel game that revolves around a protagonist named Atsuki Saijo. After the murder of his parents, Atsuki gains a mysterious power called Lux-Pain, which allows him to read the thoughts of others and remove silent, a parasitic worm that infects people's minds and leads to violence and insanity. As a member of the FORT, an organization dedicated to eradicating silent, Atsuki investigates strange occurrences in Kisaragi City while uncovering dark secrets and battling this insidious threat.