A woman appears to drive out the undead by throwing rice at them. Much to his awe and joy, Koyomi learns that the woman is none other than a grown up Mayoi. He pretend not to know her, however, and they introduce themselves to each other. Mayoi recognises Koyomi's name, and gives him a letter from the man who taught her about the rice. This man was none other than Oshino, who somehow figured out what Koyomi had done. From the letter, Koyomi and Shinobu learn that when they traveled to the past, they had traveled to a whole different timeline. He, Kaiki Deishū, and Kagenui Yozuru have been working to stop this timelines Shinobu, who is still alive, and return all the vampires back into normal humans. Instead of berating Koyomi for destroying the world, however, he praises him for saving Mayoi, and asks Koyomi as a friend that he and Shinobu save this world's Shinobu. After bidding farewell to the adult Mayoi, the pair return to the temple ruins and meet the alternate Shinobu, who cries of joy upon seeing that in another timeline, she managed to reunite with Koyomi, and offers to sacrifice herself to allow them to return to their own timeline. Back to their own rightful time, Koyomi realizes that he missed the opening ceremony much to his chagrin, and after Shinobu returns to his shadow, the ghost of Mayoi Hachikuji appears before him, and they take their time as they walk together to his house in order to return her backpack.

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Returning to the present, Koyomi and Shinobu find the whole city deserted and it does not take long for them to realize that it was a consequence of saving Mayoi's life in the past. Based on the date of the most recent newspaper they found, they come to the conclusion that something dire happened during the events of "Tsubasa Cat" and return to the shrine to look for a way to return to the past. However, they find that Oshino had put a different charm that prevents them from using its powers and when night falls they are suddenly surrounded by undead beings. After escaping, Shinobu realizes that the undead are not actually zombies, but vampires who lost their master, with said master must be none other than herself. According to her conclusions, during "Tsubasa Cat," when Shinobu ran away from home, it was Mayoi who helped Koyomi find her. But because she never became a ghost in the current timeline, Mayoi never met Koyomi, and they never became friends. Thus, he never managed to find Shinobu, leading him to be killed by the Cursed Cat. As a consequence, Shinobu starting a worldwide vampire infection (having previously pondered destroying the world) before eventually killing herself. Looking for survivors, Koyomi and Shinobu decide to use some fireworks to bring the attention of whoever managed to escape with their lives, but it ended drawing the undead to them once more.

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Realizing that he has time-traveled to a day before Mayoi's death, Koyomi decides to save her and prevent her becoming a ghost. While looking for directions, he and Shinobu meet a six-year-old Tsubasa who, suspicious of him, points them to the nearby police station. There they learn Mayoi's address and return on the following day planning to guide her safely to her mother's house. However, after hours of waiting, Mayoi's father appears, begging their help in finding his daughter, who had run away early in the morning. Koyomi manages to meet Mayoi at the same place where they first met, and succeeds in saving her from being hit by a truck and in preventing her death. Koyomi and Shinobu return to the present, their job now done, but upon arrival, they realize something is very wrong: the world has been annihilated.

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It's the last day of summer vacation and Koyomi looks for Mayoi to return the backpack she left behind at his house. On the way, he has an encounter with Yotsugi who reveals that just like him and Mayoi, she once died, but while Koyomi was transformed into an immortal being and Mayoi became a ghost, she was revived by Yuzuru as a shikigami to serve under her. With no sign of Mayoi, and with Yotsugi's words on his mind, Koyomi returns home and keeps thinking about what he could do for Mayoi until he is reminded by Shinobu that he has only a few hours to finish his summer homework. He then ponders if he could return to the past to finish it in time and, much to his surprise, Shinobu reveals that it is possible. At an abandoned temple, Shinobu opens a portal to the past and they pass by it intending to reach the previous day, but, some time later, they realize that they have traveled to eleven years in the past instead.

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