Things have returned to normal for Shinichi. Changed after his experience with Gotou, Migi retreats into his own mind to ponder his very existence. Living a normal life only lasts so long until the final loose thread comes into play.
Shinichi goes on the offensive against Gotou in a last desperate attempt. Obviously outmatched, he still manages to survive much longer than Gotou anticipated. After remembering the municipal building incident and getting a lucky strike in, the tide begins to change.
Hirokawa reveals his reasons for creating his Parasyte haven, and his final secret is revealed. Meanwhile, Gotou is still on the rampage, and eventually finds his way to Shinichi. Weakened from taking down the many exterminator squads, he decides to retreat, but not before giving Shinichi a clear threat. Starting to struggle with paranoia, Shinchi finds consolation in the arms of Murano.
Shinichi confronts the killer in front of him. His loss of cool makes Hirama even more suspicious. While Shinichi tries to go back to a peaceful life, Hirama ropes him in for the final assault on Parasyte headquarters.
Tamura uses her final moments to give Shinichi a message about what her Parasyte experience has meant to her. In the wake of her death, Shinichi finally comes to terms with the loss he has experienced. Now under police protection, Shinichi continues to give no hints to his true nature. Still suspicious, the police use their last ace in the hole.
Tamera faces off against three Parasytes at once. Using her keen insight into Parasyte morphology and unorthodox behavior, she manages to best them all without a scratch. In the mean time, the detective has taken her child for his own revenge. As Tamura and Shinichi face off, Murano and the police are finding themselves closer to the truth about Shinichi.
Shinichi starts his battle with Miki. After some quick thinking, they use their environment and their observations to launch a successful counter attack. Little do they know, Miki is not the alpha Parasyte in that body. In fact the Juggernaut I’d been waiting for was inside of him all along. Driven to his limits, Shinichi goes into hiding.