In a secret research facility, young prodigy researcher Shuri Himesaki conducts fundamental studies aimed at enhancing the reproductive capabilities of livestock such as cows and pigs. Meanwhile, Nakano, another researcher at the same institute, is deeply engrossed in applied experiments involving genetically engineered parasites based on earthworms, and is known as an ambitious scientist. Due to their differing research focuses, the two constantly clash, forming a fierce rivalry. One day, Shuri begins experiencing strange changes within her body—something is moving inside her. Can she uphold her principles as a researcher and destroy the eerie presence lurking within? Her fate is about to be decided!