On August 20th, Koyomi Araragi left his home to deliver to Mayoi Hachikuji something she had forgotten, but was unable to find her. He realized he had not done any of the homework he was supposed to do, yet tomorrow was already the term opening ceremony.

After succeeding in changing the destiny of Hachikuji, Koyomi Araragi and Shinobu Oshino returned to August 21st 11 years in the future. There, the two of them find out that their original world had been completely annihilated.

Koyomi returned from the time warp with Shinobu. From North Shirahebi Shrine, he headed home together with Mayoi Hachikuji and returned her backpack to her. However, right afterwards, the two of them are assaulted by a mysterious “Darkness.”

Kaiki meets Nadeko Sengoku face to face at North Shirahebi Shrine. Nadeko's personality became a lot brighter once she became the snake god, and she starts to talk to Kaiki in a carefree manner about how she was going to kill big brother Koyomi soon...

Tsubasa Hanekawa, supposedly overseas in search of Meme Oshino, suddenly approached Kaiki to talk to him. After exchanging information with Tsubasa, Kaiki gets the finishing touches ready for his preparations to deceive Nadeko the snake god.