Mirai Nikki

is a Japanese manga series written and illustrated by Sakae Esuno. The manga was serialized in the Kadokawa Shoten's Shōnen Ace between January 2006 and December 2010. Twelve tankōbon volumes were released in Japan. The manga has been licensed by Tokyopop, and ten of the English volumes were released, with a release for the last two now uncertain due to Tokyopop ceasing publishing in North America. A "pilot anime" DVD was released with the 11th manga volume in December 2010. A 26-episode anime television series produced by Asread aired in Japan between October 2011 and April 2012. Funimation has licensed the anime for distribution in North America. An 11-episode live-action television drama aired between April and June 2012.

Esuno has also authored three side-story manga, each one spanning five chapters: first Future Diary: Mosaic which focuses on another Diary Holder, Minene Uryu, and tells unrevealed plot points of the main story; in 2009-2010, Future Diary: Paradox (published in Young Ace), which tells the exploits of Aru Akise and Murmur set in an alternate timeline, and in 2013, Future Diary: Redial, which serves as an epilogue to the series.

Plot
Yukiteru always rejected any offers to go with friends and just keeps writing a diary on his cell phone. He has what he believes is an imaginary friend called Deus Ex Machina. However, one day Deus asks him to play a survival game along with eleven others. The winner becomes the next Deus Ex Machina. Each diary holder has a diary with a specific ability that will help them in the survival game(Most in which tell the future in different ways). In order to win, the contestants must use their diaries of the future to eliminate one another. For Yukiteru to survive, he must team up with another diary holder, a girl named Yuno.

Each player is assigned a number based on the order that Deus modified his or her diary. The diaries begin to record the future in the same manner their future selves would have written down events, with some even being able to influence the beings whose future they divulge to the owner; the only exception to this rule is when the holder reaches a Dead End, a time when their lives would be finished without significant intervention. Each diary varies in its properties and functions depending on the owner's personality, occupation and lifestyle and they all have their shortcomings. The diaries can be used without the owner's consent should they fall into another's hands. Since the diaries are written from the perspective of the owner's future self, the future can still be misinterpreted and thus the entries can become inaccurate. In addition to killing someone through normal means, if a diary is destroyed or broken, the owner also dies.