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Yukiteru Amano (or Yuki) is a loner who never really interact with people and prefers writing a diary on his cell phone with his only companion being an imaginary friend named Deus Ex Machina, the God of Time and Space. However, Yuki soon learns that Deus is not a figment of his imagination but real when Deus makes him a participant in a battle royale with eleven others.

One day, Takamiya Naho receives a letter written to herself from ten years in the future. As Naho reads on, the letter recites the exact events of the day, including the transfer of a new student into her class named Naruse Kakeru.

Set on the fictional year of 2010, the world has been split into 3 superpowers: The Holy Britannian Empire (the Americas; also called Britannia), the Chinese Federation (Asia), and the European Union (Europe and Africa; previously known as the Euro-Universe. Also known as Europa United in Akito the Exiled).

It’s been one year since the failure of the Black Rebellion and the supposed death of Zero. Britannia has assigned Area 11 a “correctional education” status, where Elevens are made an example of by brute force, to try to prevent any future uprisings and suppress rebellious thoughts.

This is the game's second OVA adaption, released on May 25, 2002. Set about twelve years before the events of the original OVA, here we see Hiroko Takashiro and Reika Kitami as students at the school, and several new characters are also introduced.

The story picks up after what happened in season one. Things that are left unexplained in the first season get explained in the new season in three separate arcs.

The Second is dead and the Gasai Yuno in the third world finally gets to live a happy life with her loving parents and friends from school. But there is still an empty place in her heart — it seems she has forgotten a person really close to her but simply cannot regain her memories.

Yukiteru Amano kept a diary he wrote in each day. He was always the bystander.

Mirai Nikki (literally Future Diary) is a dark manga about the asocial Yukiteru Amano, who obsessively keeps journals. One day, he finds that his imaginary friend Deus Ex Machina, the lord of time and space, has made his cell phone diary able to predict the future.

In Matsumoto, Naho Takamiya, a second-grade high school student, receives letters addressed from her own self 10 years into the future. She is asked to prevent her "biggest regret", which has something to do with the new transfer student from Tokyo, a boy named Kakeru Naruse.