What happens to a person when he kills the most important thing in his life with his own hands? His soul is dying. Daniel Körsed is a private detective and owner of the Themis detective agency. His life turns into a nightmare when, under the power of hypnosis, he kills his beloved girlfriend. Her image haunts him, and the voices in her head haunt. But one day, a detective answers a call from a mysterious girl, and gets hope of finding the one who made him pull the trigger. To defeat a man with supernatural powers, he makes a pact with a demon named Agatha. And begins his main investigation.