The Future Diary is een Japanse animeserie van de zender CTC (JA). De serie ging in première op 9 oktober 2011.
De middelbare scholieren Yukiteru Amano teistert het gevoel van eenzaamheid. Alleen de denkbeeldige wezens Deus Ex Machina maakt Yukiteru samenleving en verklaarde dit, dat hij de God van tijd en ruimte was. Deus Ex Machina gewijzigd Yukiterus naar de mobiele telefoon, zodat het voorspelt de toekomst van de eigenaar in een mobiele dagboek. Maar na Yukiteru de eigenaar van de nieuwe telefoons is, heeft hij samen met andere gekozen dagboek eigenaren in een spel op leven en dood om deel te nemen aan Machina aan het eind van de opvolger van Deus Ex, waar hij actief wordt ondersteund door zijn klasgenoot Yuno Gasai.
Aru deduces that the Eighth's diary is a server hosting and sending predictions to the blogs of her apprentices. When Yuki's diary predicts an attack by three of them, Aru has him moved to Kousaka's mansion. His plan is to lure the apprentices in, then deactivate the area's cell phone tower, severing their connection to the Eighth's server. Once the attack begins, however, Yuno appears and cuts the power to the tower remote control, wanting to defend Yuki by herself. Aru and Kousaka rush to deactivate the tower manually, while Yuki keeps Yuno in restraints. Two of Eighth's apprentices, Marco Ikusaba and Ai Mikami, manage to corner Yuki and Yuno by the time Aru deactivates the tower. However, Marco and Ai reveal that they are also the "owner" of a bona fide Future Diary, which has remained unaffected. With no other choice, Yuki releases Yuno, who intimidates the couple into retreating. When the third apprentice sets the mansion on fire, however, Marco and Ai counterattack. Their diaries' ability to predict each other's actions manages to overwhelm Yuno, resulting in her and Yuki getting injured and their diaries taken away. As Yuki and his friends are brooding in the hospital, they are approached by Uryu.