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Third-year high school student Koyomi Araragi barely survives a vampire attack, thanks to the help of Meme Oshino, a strange man who lives in an abandoned building. Despite being able to save his humanity, several powers from vampirism remained in his body as side effects.

The sequel to Bakemonogatari. The story follows Koyomi Araragi and the strange relationships he has with his friends and family who are afflicted by paranormal apparitions.

In the year 2021, mankind was defeated by Gastrea, a parasitical virus, and is forced to live within a wall made of Varanium Monoliths, a metal that is able to subdue Gastrea. Soon, the "Cursed Children", children born with the Gastrea virus who are able to control it—which gives them superhuman abilities—were discovered.