Araragi Koyomi and Oshino Shinobu decided to time travel back into 11 years ago using up the remaining spirit particles at the shrine from Nadeko Snake. In their adventure, Koyomi saved Hachikuji Mayoi from the car accident that killed her. When they returned to the present, they discover the world has changed drastically as a consequence of what Koyomi has done. Now they have to find an alternate way to get back to their original world.

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