Yukiteru, the main character, is a middle school student who is fine with being a loner. He considers himself merely a spectator to the world and takes logs of everything he sees around him in a diary on his cell phone. He enjoys talking with his imaginary friend, Deus ex Machina (pictured above) who is essentially god, and visits him in his room alongside his loli servant Muru Muru. Deus randomly decides one day that he wants to create a fun gave in which he will collect 12 people who like to keep cell phone diaries and change those diaries into ‘future diaries’. Each of the future diary holders must seek out and kill the others by destroying their phones, thereby destroying them, and the last person standing will take Deus’ throne as god.