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 Mayoi herself, bringing him a letter from Oshino, who somehow figured out the whole situation. From the letter, Koyomi and Shinobu learn that they had traveled to a different timeline and before they return to their unchanged, original timeline, he asks them to confront Shinobu's alternate self who is still alive, and must be destroyed to stop the undead plague and prevent the world from being destroyed for good...