During a drive with his fiancée Yuka, Tatsuya is attacked by a gang of bandits, and Yuka is taken away. Yuka, injected with a substance, has her abdomen split open, and numerous tentacles emerge, attacking the man. Something is born from Yuka and parasitically attaches to the man. At that moment, Tatsuya, who has finally arrived, rushes in to save Yuka...