Yukiteru Amano is considered a loner at school, one who only records the events around him into his cell phone like a diary. His only friend is Deus Ex Machina, the supposedly imaginary "God of Time and Space." One day, Deus, planning "an interesting game," entrusts Yukiteru with knowledge of the future with the aptly named [Future Diary], in the form of his cell phone. He soon discovers that Deus Ex Machina isn't really a figment of his imagination when his [No Difference Diary] actually begins predicting the events around him. The only way to escape a [DEAD END] is to change the future...