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.

Shinobu Oshino realizes that humanity had turned into zombies thanks to the powers of Kiss-shot. Koyomi Araragi shoots up fireworks as an SOS signal, but instead they are surrounded by zombies. However, an unexpected individual arrives at the scene...