The core idea is the story of a hero seeking a cure for a mysterious blood disease. To slow down his transformation, he experiments with various methods, one of which involves entering a symbiotic relationship with an alien parasite that consumes the poisonous substances in his body as if they were a delicacy. In his struggle against the ailment and his search for a solution, he is aided by a forced ally. However, the self-serving motives behind this partnership are bound to bring disaster upon the hero sooner or later.