Chan is a Chinese factory worker whose life revolves around a strict routine: she eats breakfast, goes to work, and returns home to eat the same thing for dinner. Every night she experiences horrific nightmares, featuring a ghost monster that has an uncanny resemblance to the foreigner who lives in the apartment next door, a Japanese office lady. In waking life, the two women only encounter each other in the apartment hallway. They interact in an entirely benign, polite and somewhat awkward manner - a stark contrast to the violent and deeply disturbing visions of Chan’s nightmares.
Chan is always too disturbed to strike up a conversation and so they never discover the coincidence that Yamada is also haunted in her bad dreams by her neighbour, Chan.