A short OVA that was bundled with the limited edition of the eleventh volume of the manga.

Yukiteru Amano is a loner who spends his time writing in his mobile diary and talking to an imaginary friend, Deus Ex Machina. However, one morning, he finds his diary entry for the day has been filled in already. Stranger yet, the events portrayed in the diary start coming true. Deus, who reveals he is an actual God, warns Yukiteru that if he loses his diary, he will die. As Yukiteru starts using the diary to his advantage, he is approached by a stalker named Yuno Gasai who also possesses a Future Diary that foretold his death at the hands of a serial killer, another Future Diary owner. Helping him evade the killer, Yuno helps Yukiteru throw a dart into the killer's phone, killing him. Afterwards, Deus explains the rules of the survival game to Yukiteru and the other diary owners, in which they must try to kill each other in order to win the right to succeed him.

Yuki is trying to figure out the reason behind Yunos Future Love Diary when a woman named Uryuu Minene interrupts him. She quickly identifies him as the 1st and announces that she is the 9th and that the 1st will die.

Yomotsu appears before the fleeing Yuki, Yuno and Tsubaki with four hypnotised cult members dressed like him. Yomotsu explains that his Righteous Diary led him to infiltrate the Sacred Eye cult and that he intends to blow himself and Tsubaki up using Uryu's bomb. Having learned from Keigo that Yomotsu is blind, Yuno manages to find and kill him. Tsubaki then has her followers capture Yuki and Yuno, revealing her plan was to kill them, Keigo and Yomotsu all along. Due to her traumatic past as a ritual rape victim, Tsubaki wishes to attain Deus' power in order to remake the world. Yuno manages to kill the guards holding her, cut off Tsubaki's hand and hand Yuki her diary before collapsing from exhaustion. Using both diaries, Yuki manages to avoid detection, until Tsubaki tries to lure him out by announcing that her followers will rape and kill Yuno. Realising Yuno's devotion to him, Yuki gathers his courage and manages to reach Yuno on time, but Tsubaki gloats that as long as he's in sight of her followers, his actions will be predicted in her diary. Yuki throws a small ball he found earlier up in the air, causing all of Tsubaki's followers to look at it and rendering her diary useless. Yuki then throws a dart at Tsubaki's diary, and since she is missing a hand, she is unable to deflect the shot. With her diary pierced, Tsubaki vanishes and Yuki and Yuno escape. Meanwhile, Uryu, who was released by Yomotsu, gets captured by Keigo, but he eventually lets her go in return for her contact information.

In a flashback, Keigo forms an alliance with Uryu, promising to stop pursuing her and asking her to take care of his terminally ill son if he is eliminated from the Survival Game. Yuki and Yuno get arrested and brought to Keigo. In the interrogation room, Keigo forces Yuki to play a rigged game of Russian Roulette with his service revolver. Alerted to Keigo's treachery by her diary, Yuno knocks out the detectives guarding her and steals their guns. Just before Yuki gets shot, Yuno breaks into the room, injures Keigo and leaves with Yuki. Panicking, Yuki shoots at one of the policemen pursuing them. Since both Yuki and Yuno have now committed a crime, their actions can be detected by Keigo's diary, which was his plan all along. Trapped at the police station's roof, Yuki and Yuno jump off, but a truck's tarp breaks their fall. The next day, Yuki and Yuno are hiding from the police when they notice Keigo's wife visiting a hospital. When they follow her, they get ambushed by Uryu, who blows part of the floor up. After Yuki accidentally causes more of the floor to collapse, Uryu allies with Yuki in order to have Yuno pull them both to safety, incurring Keigo's wrath in the process. With their deaths foretold in all three diaries, Uryu takes Yuki and Yuno to the room where Keigo's son and wife are.

When Deus realises that his assistant, Murmur, manipulated events to hasten Keigo's elimination, she claims she wants the game concluded before he has to "retire" and challenges him to a wager on the winner of the survival game, with her picking Yuno and Deus betting on Yuki. Yuki and Yuno go on a stargazing trip, but Yuno alters their destination along the way. Worried about Yuki's safety, Aru contacts Nishijima and they manage to narrow Yuki and Yuno's location down to a run-down holiday resort, enlisting Hinata, Mao and Kousaka to search for them. As they split up and search the abandoned hotels, Aru and Kousaka face various traps set by Yuno, while Hinata is tricked by a text message Yuno sent from Yuki's phone. When the others attempt to find Hinata, they get locked in a room which starts to fill up with gas. At the end of the episode, Yuki is shown bound to a chair, with an ecstatic Yuno sitting between two skulls.

Despite Aru's revelation, Yuki declares his trust in Yuno. Balks connects Kamado's server to HOLON, a supercomputer which holds user accounts of every citizen of the city, making them his apprentices. Uryu tries to attack Balks, but his diary lets him turn the tables. Nishijima, who's fallen in love with Uryu, comes to her aid and destroys the supercomputer. However, it turns out to be only one part of the whole, and Balks' plan is put into motion. As Aru sends Hinata, Mao and Kousaka to help Uryu and Nishijima destroy the remaining parts of HOLON, Uryu figures out Balks' diary can read the predictions of all other Future Diaries. Deus reveals to Uryu that Balks helped him design the Future Diaries, wishing to grant divine power to the human race. Uryu, Nishijima, Hinata, Mao and Kousaka storm HOLON's location, overwriting their diaries' predictions to confuse Balks. In response, Balks makes use of his secretary's diary and manages to capture Hinata, Mao and Kousaka, as well as injure Uryu and kill Nishijima. Uryu is saved by Yuki and Yuno, who've used her as bait to get to Balks.

After some hesitation at seeing the innocence of her other self, Yuno lunges at her, but she is stopped by her other self's parents. Meanwhile, the actions of Yuki and Uryu have caused a domino effect that has changed the future of almost every diary holder for the better. When Balks reads about his other self's death in Yuki's diary using his incomplete Watcher Diary, he calls off his partnership with Deus, who decides to cancel the survival game and find another method to determine his successor. Yuki manages to remember Yuno and break free from the illusionary world, in the process releasing his world's Murmur, who had been trapped by her first world self in order to impersonate her. Faced with Yuki's love and her other self's united family, Yuno's resolve to kill them all is lost, and she decides to commit suicide. A horrified Yuki is declared winner of the survival game by his world's Murmur and spirited away through a vortex. 10,000 years on, Yuki is still grieving Yuno's death in his now empty universe, refusing to create anything. At the end of the episode, the final entry in his diary changes from "Yuno died" to "Yuno came to see me", and her voice is heard calling his name.

Yuno Gasai lives a normal life as a first-year in high school. She gets along well with her parents and even has a small circle of friends. However, she cannot help but feel as if someone is missing from her life, someone so important to her that it was as if she had lived another life trying desperately to stay with them. After a class trip to the beach, Yuno returns home; but in the middle of the night, she receives strange messages from a voice only she can hear. The voice informs her of the person she is desperate to meet and that she must find him. Soon, she finds herself in a mysterious realm, her only goal being reunited with the person she cannot remember. Though obstacles stand in her way, Yuno will stop at nothing to meet her beloved once again.