After her husband's transfer, Chihiro moves into a luxury apartment in central Tokyo. Just as she finishes moving in and begins to settle into her new life, her husband suddenly announces a five-day business trip. Learning of this, the building's suspicious-looking manager begins to act. That night, Chihiro is attacked by a dark figure sneaking in from somewhere, losing consciousness. When she wakes up, an unexpected person stands before her. Amid growing fear and anxiety, Chihiro gradually uncovers the shocking truth.