
Mirai Nikki (未来日記, Future Diary) is a Japanese anime and manga series written and illustrated by Sakae Esuno.
Plot
Middle school student Amano Yukiteru has problem making friends. He thinks of himself as a bystander and will always write down everything he sees in a cell phone diary.
Tormented by solitude, Yukiteru interacts with his imaginary friends Deus Ex Machina, the God of Time and Space, and Muru Muru, Deus' servant. One day, Deus grants Yukiteru's cell phone the ability to record the future for the next 90 days. Yukiteru is then forced to participate in a battle royale with eleven other people, each of whom also have a diary that can predict the future in some unique way.
The rules of the game are simple: before the world ends on day 90, the contestants must find and kill all the other contestants, and the last one standing will become Deus' successor.
Becoming God...?
I will save everyone.
Diary Holders

There are a total of 12 Diary Holders, with each player assigned a number based on the order that Deus modified their diary.
Each diary varies in properties and functions depending on the Holder's personality, occupation and lifestyle. If a diary is destroyed, the Holder's future is also destroyed, killing them.
Each Diary Holder is inspired by a Consentes Dii (Olympian God).

The First: Amano Yukiteru
Diary: Random Diary
Consentes Dii: Jupiter
A reclusive and shy 14-year-old middle school student. He opts to be a bystander and writes about incidents that happen around him in his diary, located within his phone.
His diary predicts future events happening around him from his point of view.
Diary: Random Diary
Consentes Dii: Jupiter
A reclusive and shy 14-year-old middle school student. He opts to be a bystander and writes about incidents that happen around him in his diary, located within his phone.
His diary predicts future events happening around him from his point of view.

The Second: Gasai Yuno
Diary: Yukiteru Diary
Consentes Dii: Juno
Yukiteru's classmate. While a perfect model student on the surface, she is actually a psychopathic yandere who is borderline obsessed with Yukiteru, whom she affectionately calls "Yukki", and kills unhesitatingly to protect him.
Her diary gives her explicit details on whatever Yuki is doing every 10 minutes.
Diary: Yukiteru Diary
Consentes Dii: Juno
Yukiteru's classmate. While a perfect model student on the surface, she is actually a psychopathic yandere who is borderline obsessed with Yukiteru, whom she affectionately calls "Yukki", and kills unhesitatingly to protect him.
Her diary gives her explicit details on whatever Yuki is doing every 10 minutes.

The Third: Hiyama Takao
Diary: Murder Diary
Consentes Dii: Vulcanus
Yukiteru and Yuno's school teacher who is secretly a serial killer. He wears a heavy bulletproof trenchcoat with a hat and mask to hide his identity.
His diary gives him details on who his next victims are and where and how he kills them.
Diary: Murder Diary
Consentes Dii: Vulcanus
Yukiteru and Yuno's school teacher who is secretly a serial killer. He wears a heavy bulletproof trenchcoat with a hat and mask to hide his identity.
His diary gives him details on who his next victims are and where and how he kills them.

The Fourth: Kurusu Keigo
Diary: Criminal Investigation Diary
Consentes Dii: Mercurius
A police captain who was chosen for the Diary Game to balance out the other users.
His diary gives him details of crimes that will happen within the next 90 days, but it cannot predict the future of an investigation done by someone other than himself.
Diary: Criminal Investigation Diary
Consentes Dii: Mercurius
A police captain who was chosen for the Diary Game to balance out the other users.
His diary gives him details of crimes that will happen within the next 90 days, but it cannot predict the future of an investigation done by someone other than himself.

The Fifth: Houjou Reisuke
Diary: Hyper Vision Diary
Consentes Dii: Ceres
An orphaned five-year-old boy who is very intelligent for his age. He is sent to live with Yukiteru and his mother after his parents die.
His diary is a coloring book that gives a small summary of the activities that he may perform for the day. However, his diary only shows three entries for the day: during the morning, noon, and night.
Diary: Hyper Vision Diary
Consentes Dii: Ceres
An orphaned five-year-old boy who is very intelligent for his age. He is sent to live with Yukiteru and his mother after his parents die.
His diary is a coloring book that gives a small summary of the activities that he may perform for the day. However, his diary only shows three entries for the day: during the morning, noon, and night.

The Sixth: Kasugano Tsubaki
Diary: Clairvoyance Diary
Consentes Dii: Apollo
A physically inept girl with bad eyesight, she is the leader of the Omekata cult where she serves as the group's priestess.
Her diary is a scroll that details what her followers see and do.
Diary: Clairvoyance Diary
Consentes Dii: Apollo
A physically inept girl with bad eyesight, she is the leader of the Omekata cult where she serves as the group's priestess.
Her diary is a scroll that details what her followers see and do.

The Seventh: Ikusaba Marco and Mikami Ai
Diaries: Exchange Diaries
Consentes Diis: Mars and Venus
Originally assumed to be two separate Diary users, Marco and Ai are in fact both the Seventh Diary user. Both orphaned at a young age and sent to the same orphanage, they are a couple and are soon to be married.
Their diaries report each other's immediate future.
Diaries: Exchange Diaries
Consentes Diis: Mars and Venus
Originally assumed to be two separate Diary users, Marco and Ai are in fact both the Seventh Diary user. Both orphaned at a young age and sent to the same orphanage, they are a couple and are soon to be married.
Their diaries report each other's immediate future.

The Eighth: Ueshita Kamado
Diary: Blog Diary
Consentes Dii: Vesta
She is in charge of the "Mother's Home" orphanage where Marco and Ai were raised. She cares deeply about her children.
Her diary is a server that can be accessed by the people she allows in, giving each person their own "Apprentice Diary" that can predict the future in their own various ways. Her diary essentially makes others Diary Holders without the fear of death.
Diary: Blog Diary
Consentes Dii: Vesta
She is in charge of the "Mother's Home" orphanage where Marco and Ai were raised. She cares deeply about her children.
Her diary is a server that can be accessed by the people she allows in, giving each person their own "Apprentice Diary" that can predict the future in their own various ways. Her diary essentially makes others Diary Holders without the fear of death.

The Ninth: Uryuu Minene
Diary: Escape Diary
Consentes Dii: Minerva
An infamous atheist terrorist, Minene is a young woman who has hatred towards organized religion, particularly belief towards God.
Her diary charts out the best course of action to escape whenever she finds herself in a dangerous situation.
Diary: Escape Diary
Consentes Dii: Minerva
An infamous atheist terrorist, Minene is a young woman who has hatred towards organized religion, particularly belief towards God.
Her diary charts out the best course of action to escape whenever she finds herself in a dangerous situation.

The Tenth: Tsukishima Karyuudo
Diary: Breeder's Diary
Consentes Dii: Diana
A rich man with elegant taste, Karyuudo is a dog breeder who loves and cares about his dogs so much that he neglects his family, to the point that his wife leaves him.
His diary allows him to control his dogs into attacking his enemies by using his cellphone as a voice commander.
Diary: Breeder's Diary
Consentes Dii: Diana
A rich man with elegant taste, Karyuudo is a dog breeder who loves and cares about his dogs so much that he neglects his family, to the point that his wife leaves him.
His diary allows him to control his dogs into attacking his enemies by using his cellphone as a voice commander.

The Eleventh: John Bacchus
Diary: Watcher Diary
Consentes Dii: Bacchus
The Mayor of Sakurami City and the mastermind behind the Diary Game, as he was the one who convinced Deus to create the battle royale to determine Deus' successor.
His diary enables him to read other diary users' entries, including other Apprentice Diaries.
Diary: Watcher Diary
Consentes Dii: Bacchus
The Mayor of Sakurami City and the mastermind behind the Diary Game, as he was the one who convinced Deus to create the battle royale to determine Deus' successor.
His diary enables him to read other diary users' entries, including other Apprentice Diaries.

The Twelfth: Hirasaka Yomotsu
Diary: Justice Diary
Consentes Dii: Pluto
Blind and insane, he is a vigilante who acts like a tokusatsu hero. He has superhuman hearing to make up for his blindness.
His diary is a tape recorder that has the ability to tell him what evil deeds that will happen in the future. His diary can also give people hallucinations and hypnotize them.
Diary: Justice Diary
Consentes Dii: Pluto
Blind and insane, he is a vigilante who acts like a tokusatsu hero. He has superhuman hearing to make up for his blindness.
His diary is a tape recorder that has the ability to tell him what evil deeds that will happen in the future. His diary can also give people hallucinations and hypnotize them.