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Yuki has isolated himself from his high school student life; even his cell phone reflects his detachment, since it only contains information about his surroundings. In his fantasies Yuki is chosen by his friend Deux Ex Machina to participate in a survival game of twelve people, each with a clairvoyant personal diary. The remaining survivor will become the new Lord of Time and Space. However, Yuki wakes from his fantasy to find that his dreams have become reality; his diary now has entries from the future about his surroundings, and he learns that his classmate Yuno is also participating. Even worse, Yuki finds an entry for his imminent Dead End. To stay alive he becomes Yuno's partner, but her diary only contains what will happen to her beloved Yuki. Yuno swears to protect Yuki and uphold her unwavering love for him; she will protect their bond, no matter who she has to get rid of.
When I first started reading, I thought it was like a reverse version of Mirair Nikki; instead of there being a psycho girl yandere, there is a psycho boy yandere supposedly who knew the main character in another dimension or whateveer.
It's sci-fi esque and it's very fun to read. the mc of this series is just as useless as the mc of Mirai Nikki if not more so because she has no personality but she is gaining one throughout the story.