Fuminori's surgeon, Doctor Ryoko Tanbo, saves Koji from the well, aware of Saya, and already investigating Ogai. The two discover a secret chamber in the well and find Ogai's corpse as well as his research of Saya and her species. Koji goes to Fuminori's home and discovers Omi's and the Suzumi family's flesh in his refrigerator. From here, Koji can either call Ryoko or Fuminori. If Koji calls Fuminori, the two confront each other at an abandoned sanctuary. Koji attempts to kill Fuminori but instead finds Yoh, who begs for him to kill her and end her pain. Koji, driven insane by her monstrous appearance, shoots her and beats her to death with a steel pipe before engaging in battle with Fuminori. He overpowers Fuminori but is killed by Saya before he can deliver the fatal blow. Saya then collapses and reveals that she is pregnant. She releases her spores as her "last gift" to Fuminori, who looks on in joy as the spores target humanity, changing all of them into the same beings as Saya. Ryoko, hiding in Ogai's mountain cabin, finishes transcribing his research and learns all she can about Saya and her race before resigning herself to her fate of mutation.