Future dairy

Yuki Amano is a loner who spends most of his time writing a diary on his cell phone or talking with his imaginary friends Deus Ex Machina, the God of Time and Space. One day, Deus gives Yuki a special diary, mentioning something about a game. Strangely, Yuki's new diary has entries about the future that come true. Deus, the God of Time and Space, then forces Yuki to participate in a battle with eleven other people, each of whom also has a diary that can predict the future in some unique way. The rules of this "Diary Game" are simple...the players must try to find and kill all the other players before the world ends on Day 90, and only the last one standing can prevent the destruction of the world and become the new God of Time and Space.