The world is stained. It is an exorcist's solemn duty to clean it—no matter the obstacle or cost.  Our world is host to a psychic sea filled with the filth of human emotion and trauma. It is constantly roiling; sometimes, that filth spills over into the real world as Sin-physic monstrosities that exist to cause as much suffering as possible. Unbeknownst to most, a supra-governmental organization known as CAIN was formed to combat this psychic threat. CAIN abducts and trains those with psychic potential to act as exorcists, expendable tools who exist solely to fight back against Sin.  This is the story of one such team of exorcists and their desperate struggle to purge the world of Sin. To fight until the stain is wiped away.