"I love you so much I can't bear it... That's why I'm watching your every moment, nonstop, 24 hours a day." This obsession grows so intense it begins to threaten her everyday life. Through surveillance cameras, a man's gaze fixates on her—an expression of twisted, obsessive love. Yui, a married woman living a happy family life, gradually becomes entangled in eerie, unsettling events. Soon, her life spirals irrevocably into darkness.