Sakae Esuno's manga inspires this mind-bending psychological thriller that follows the story of Yuki, an isolated individual who confides in his diary and Deus Ex Machina - the God of Time and Space, who is just a product of his imagination. Things take a spine-chilling turn when Deus Ex Machina compels Yuki to participate in a deadly competition where he has to face eleven rivals wielding unique diaries that predict the future. At this moment, Yuki realizes that his imaginary friend is much more real than he had ever thought. As Yuki races against the clock and tries to outlast his opponents for 90 days, he must employ cunning strategies and overcome the treacherous agendas of his enemies to emerge victorious as the new God of Time and Space.