College student Kumi falls in love with Shota at a university mixer and the two promise to marry each other on the night of Tanabata. However, she soon begins suffering from nightmares and gradually loses her mental stability. Shota picks up a strange DVD from a vending machine, and when he plays it, the images Kumi saw in her dreams appear in reality. As the boundary between dreams and reality blurs, grotesque events unfold one after another inside Kumi's mind, leaving her confused—asking herself, "Is this a dream, or is it real?" The story relentlessly pursues the truth, evoking deep fear and contemplation in the viewer.