A secret organization called "Doress" has funded the development of a genetically engineered parasite code-named "_BAOH_." Organisms infected by _BAOH_ become living survival machines, virtually indestructible, able to mutate their body structure to meet any threat. Properly controlled, the _BAOH_ parasite could allow Doress to control the World.
Unfortunately, their first human guinea-pig, a young man named Hashizawa Ikuroo, has managed to escape, along with a young girl, Sumire, who has a strange precognitive gift. Unless Doress operatives can find and destroy Ikuroo before the _BAOH_ parasite fully manifests, their evil dream will come to naught.
But _BAOH_, comfortably hiding in Ikuroo's brain, won't make it easy.
(Source: AnimEigo)