Yukiteru Amano, a junior high student, he has trouble making friends. He views himself as a spectator from the sidelines and often writes down what he sees in his cell phone diary. Tormented by his solitude, yukiteru interacts with his imaginary friends Deus Ex Machina, the God of time and space, and muru muru, Deus' servant. One day Deus grants yukiteru's cell phone the ability to see the future up to 90 days. Yukiteru is then forced in a battle royale with eleven other future diary users. The last one standing will become a god.