The story is about Yuki, a high school student who lives a mundane life until he receives a diary from a supposed god named Deus. This diary allows Yuki to see the future, specifically the events that will occur for the next 90 days. Yuki soon discovers that there are 11 other people who also possess similar diaries, and they are all part of a survival game where the last person standing will become the new god.
Throughout the series, Yuki forms alliances and friendships with some of the other diary holders, including Yuno, a pink-haired girl who becomes his obsessive girlfriend. As the game progresses, Yuki and his friends must navigate the complex web of relationships and alliances between the diary holders, all while trying to stay alive and uncover the secrets behind the game.
Meanwhile, Yuki's past is slowly revealed, and it is discovered that he is actually the reincarnation of a past winner of the game. Yuno, who is also a past winner, has been trying to prevent her past self from killing herself, and Yuki's existence is crucial to her plan.
The series takes a dramatic turn when Yuki's friends start to die, and he is left alone to face the final challenges of the game. In the end, Yuki becomes the new god and is left to rule the world, but not before a bittersweet reunion with Yuno, who ultimately sacrifices herself to save Yuki.
The series concludes with Yuki reflecting on the events of the game and the true nature of his existence.
Here are the key facts extracted from the text:
1. Yuki (also known as Yupi Theroux) is a protagonist who spends most of his time alone, writing in his diary.
2. Yuki has a diary that allows him to read the future.
3. Deus, a god of time, gives Yuki his power.
4. Yuki is in a survival game with 11 other participants, where they must kill each other to become the new god.
5. The game involves using their "diaries of the future" to gain an advantage over their opponents.
6. Yuki has a toxic girlfriend who also has a diary of the future.
7. The ninth owner of a diary is a police officer who helps Yuki.
8. The twelfth owner of a diary is a mysterious and half-crazy individual who can create "apprentice diaries" that tell the future.
9. Yuki's father is a key character who is involved in the game.
10. The eighth owner of a diary has the ability to connect his diary with the servers of the eleventh owner.
11. The ninth owner of a diary can create a new diary after hers is destroyed.
12. The game's objective is for the last person standing to become the new god.
13. Yuki's mother dies, and his father is suspected of being involved in her death.
14. The eighth owner of a diary reveals that he created the game and that the dead cannot be revived.
15. The game's participants are reduced to three: Yuki, the eighth owner, and the second owner.
16. The eighth owner is disintegrated but returns to normal with the help of his diary.
17. Yuki's diary is destroyed, but he had another diary and is still alive.
18. The eighth owner cuts his throat but is still alive because he had another diary.
19. The eighth owner is about to reveal a secret about Yuki's past when he is killed.
20. Yuki becomes the new god after Deus falls apart.
21. The ninth owner has her powers restored and helps Yuki in the final battle.
22. Yuki escapes from an imaginary prison with the help of the second owner.
23. Yuki becomes a god and is left alone in the middle of nowhere.