Ray keeps seeing a recurring dream in which his beloved Mirai happily smiles against the backdrop of a pink winter sky. But reality turns out to be different: Mirai mysteriously disappeared, and it remains a mystery… Only three years later, a mysterious person gives Ray a clue, mentioning a Diary that changed their world. But what if the Diary had never existed? Mirai didn’t disappear, but… Ray’s best friend died because of him? Ray was expelled from university? The girl he loves behaves strangely?… Ray will have to face another reality, where everything is turned upside down.