Kiseichū: The Parasite That Kills Me is a psychological thriller that delves into the mind of a lonely man named NWB, isolated in his house during a global quarantine. After a disturbing dream, he finds himself drawn to his live-in maid, leading to a new and complex relationship. The story takes a dark turn when the maid becomes pregnant, and a devastating tragedy shatters NWB’s fragile state of mind. As he struggles with immense grief and trauma, he begins to experience grotesque physical and psychological distortions, believing he is haunted by a mysterious "parasite". The book explores themes of mental illness, psychological conflict, and the complex nature of human relationships, leaving NWB to confront his inner demons and the terrifying reality he now faces.