Yukuki Amano (voiced by Mikura Tomihiro) is a lonely teenager who likes to record daily trivial matters on his mobile phone. One day by chance, he found out that he actually had "The Future Diary" that could predict the future. At this time, he was excited. Curious, he didn't know that he had been involved in an endless game of killing. As the god of time and space who controls the entire game, Zeus (voiced by Norio Wakamoto) selected 12 men and women of different ages and occupations and gave them "The Future Diary" with different abilities. All they have to do is to do their best. You can use your diary to escape the chase of your companions and kill your companions as much as possible. The loser will disappear with the diary, and the final winner can become the god of the next game.
It's such a cruel game for no reason. As a classmate, my wife Yuno (voiced by Tomisa Murata), who has always admired Xuehui, is also involved in it. What kind of powerful opponent will they face? Can the kind and simple ones escape the control of God?