Shoko Sakura attends a marriage activity party at the invitation of her best friend, Miho, where she meets a refreshingly charming young man, Hitoshi Mayumura. Later, she unexpectedly runs into him near her office, and when he moves into the apartment next door, she can't help but feel a sense of fate... However, behind his friendly facade, Mayumura hides a dangerously dark side! Under the guise of coincidence, Mayumura has been stalking Shoko all along! His madness steadily creeps closer... her peaceful daily life begins to erode... and an unfathomable fear closes in on Shoko!