Every 333 years the ultimate universal devil known as Kuiba is reborn. With each rebirth, Kuiba brings absolute destruction. In order to battle Kuiba, Deities and people team up and assassinate him just before his revival. In 1664, the year of Kuiba's rebirth, the assassination attempt failed. Kuiba managed to slip into the young body of Manji. As the child grew older, Manji grew a strong desire to become the greatest warrior. When Manji hears the armies of Earth are recruiting to battle Kuiba, Manji and his master enlists to find and fight Kuiba. What he doesn't know is the one he is aiming to destroy is himself. How will he face his fate and accept his destiny?

In today's world full of wondrous technological innovation, the unnatural and mysterious sometimes appear even more horrifying than usual. But despite how far society has advanced, the fear of the unknown always remains. The unfortunate participants in Kowabon find themselves in such a predicament, experiencing the supernatural through their everyday technology. From a frightening sight caught on a parking garage camera to a video chat that takes an unexpected turn, the victims struggle to escape that which haunts them. However, what awaits these doomed souls may be a fate even worse than death...

Whether it is investigating stone shrines, tracking rumors, or simply playing hide and seek, Koyomi Araragi is always there to fulfill the requests of his friends from both the human and supernatural worlds. In this series of short stories, Koyomi helps each of the girls in his cohort solve a mystery or kill some time, all while slowly unraveling the truth about his town and its many supernatural occurrences.

Half a year has passed. Arriving in the Iron Fortress, Ikoma and Mumei set foot in Unato: another ravaged zone that fell into the grip of the deadly Kabane. In this war-torn zone, the group fends off more dangerous Kabane that are attacking with patterns they had never seen before. The Iron Fortress crew eventually meet up with a survival group which requests their aid in reclaiming the zone. The newly forged alliance ventures deeper into the area of the castle and investigates the peculiar case of these new Kabane. But their search for answers unearths truths that are far more horrifying than they imagined. Forced to confront the reality behind the Kabane, Ikoma, Mumei, and their allies come to realize the despair buried within Unato.