Yuki Amano (voiced by Misuzu Togashi) is a lonely teenager who likes to record daily trivia on his mobile phone. One day, he accidentally discovered that he actually had a "Future Diary" that could predict the future. At this time, he was excited and curious, but he didn't know that he had been involved in an endless killing game. 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 professions, and gave them "Future Diaries" with different abilities. All they have to do is to use their diaries to the best of their ability to escape the pursuit of their companions and kill them as much as possible. The loser will disappear with the diary, and the final winner can become the god of the next game. It is such a cruel game without reason. As a classmate, Yuno Agatsuma (voiced by Chisa Murata) who has always admired Yuki is also involved. What kind of powerful opponent will they face? Can they escape the control of God with their kindness and simplicity?