Mado no Hitomi (Momoko Isshiki), a married woman, was left anxious and unsettled during her husband's business trip, enduring uncertain days. Unable to confide in anyone, she turned to Keiko (Maki Tomoda), the apartment manager and her former coworker, for advice. However, the stalking incidents continued even after their conversation, deepening Hitomi's distress. In truth, the stalker was Keiko herself—someone who had secretly harbored romantic feelings for Hitomi for years. Pretending to care for her, Keiko manipulated her way into Hitomi's life, luring her to move into the apartment complex and drawing closer to her body under the guise of concern. This twisted obsession soon became a menacing force, threatening to destroy Hitomi's everyday life.