Zoku Owarimonogatari

Graduation day finally arrives for Koyomi Araragi, and he assumes his strange high school life has reached its ending. The next morning, however, he touches his bathroom mirror and is pulled into a reversed world where everyone is familiar yet altered in unsettling ways: Karen is shorter, Mayoi is an adult, and Yotsugi is overflowing with emotion.

At first the place seems like a warped parody of his own world, but Araragi gradually realizes that the differences are not random. They reflect possibilities and sides of people he never saw or refused to recognize, forcing him to confront what he left unresolved when school ended. Returning home will take more than breaking a mirror; he must understand why he was drawn inside it and what part of his life still refuses to accept that an ending has actually arrived.