Ichimatsu Kairo, an office worker, has been haunted by the memory of his ex-girlfriend, Kusakabe Hiyori, who disappeared seven years ago after dumping him. Despite his efforts to move on, he remains stuck in the past, reliving their memories through videos and pictures. After his house is struck by lightning and he loses everything, Kairo reaches his breaking point and tries to take his own life. However, his fate takes an unexpected turn when Hiyori suddenly contacts him with a strange request.