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 talks to Yuno through her surveillance feed, revealing he dug up three corpses from her garden, two of which had recently had their skulls removed. When he threatens to give this information to the police unless she releases them, the stress causes Yuno to alter her memory again, rendering negotiations moot. As Kousaka uses his cell phone to post his will in his blog, it is apparently turned into a Future Diary by the Eighth diary holder, who adresses him as an "apprentice". On Aru's advice, Kousaka acts out his diary's predictions, reaching an amnesiac Yuno, a catatonic Yuki and a bound Hinata in the control room. His appearance causes Yuki to recover, recalling how Yuno abducted him to keep him safe until July 28th. Yuno places the key to Yuki's shackles on the floor and tosses Kousaka the control panel key, allowing him to free Aru and Mao. Yuno then takes advantage of Kousaka's distraction and shoots at him with a crossbow. However, Yuki, having had his key kicked over to him by Hinata, frees himself and stops Yuno, leaving her behind when his diary predicts the imminent arrival of three diary holders, all apprentices of the Eighth.