When a young man’s girlfriend mysteriously vanishes, he becomes convinced that she has gone to a strange, imagined city she once described—a walled place where shadows are separated from their owners and unicorns roam its quiet streets. Unable to let go, he begins a search that gradually extends across years, shaping the course of his life.

As he grows older, his path leads him to a remote library in a secluded town, where his solitary work and encounters with others deepen his sense that the boundary between reality and the otherworldly city is not as fixed as it once seemed. Drawn between these two realms, he begins to move—both physically and inwardly—toward the place he has been seeking.

Within that shadowless city, he finds the girl again, working in a dreamlike library, unchanged yet unreachable, with no memory of their past. As the distance between worlds begins to blur, he is forced to confront what it means to hold on, to let go, and to choose between competing versions of reality. The City and Its Uncertain Walls is a quiet, haunting exploration of love, memory, and the fragile boundaries that define identity.