Six high school students, who have finished their college entrance examinations, accidentally discover a haunted house with eerie rumors to it. Inside there, the students start to hear the whispers of death and vanish one by one, as unstoppable, extreme terror engulfs them.
Nobody knows where they came from. They parasitize in human beings, take control of them and change their bodies into hideous monsters (Necro-borg). The Necro-borg fight each other until the other dies. Where did they come from? To what end? Yuji and Kaoru, whom both have dark secrets within themselves, get caught up in the horrific battles of Necro-borg. What will their fate be?
Kohei has suffered from hearing loss since middle school and had trouble fitting in with those around him. Now a university student, Kohei meets the outgoing Taichi in the university courtyard. Their friendship becomes one in which they can say whatever is on their minds, but Kohei, who has grown used to keeping people from getting too close, now faces escalating expectations and anxiety the stronger his bonds with Taichi becomes.