Araragi and Shinobu discover survivors of the vampire zombie apocalypse. With a helpful note from an old friend, they find a possible means of returning to their proper timeline.

Araragi and Shinobu return to the present, only to discover the horrible consequences of saving Mayoi.

Shinobu figures out how to return to the present but Araragi finds the date they arrived too convenient to be a coincidence. He tries to help by changing the future, but altering time is never, ever a good idea.

After recalling the events of Nekomonogatari Black, Araragi finds Hachikuji’s backpack and encounters Ononoki while searching for her. Summer vacation ends and Araragi realizes he has not done his homework. He jokingly asks Shinobu to take him back in time one day so he can finish it… this will not end well.