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Yukiteru Amano thinks the only two things he has in life are his diary and an imaginary world of his with two friends: Deus Ex Machina and Murumuru. Things change when his diary starts predicting the future.
Having bested the Third Diary User with the help of Yuno, Yukiteru now has a giant target painted on him. A bomb wielding Diary User takes the school hostage, and Yukiteru must decide if he can trust Yuno, even though she's been stalking him!