As Koyomi Araragi's high school days come to a close, he is unexpectedly pulled into a surreal world within his bathroom mirror on graduation day. Here, everything he knows is inverted—his sister Karen is unusually small, the stoic Yotsugi Ononoki is now expressive, and the young spirit Mayoi Hachikuji has aged significantly. In Zoku Owarimonogatari, Araragi navigates this topsy-turvy realm, striving to find his way back home while unraveling the mysteries of this strange dimension.