The Future Diary is the English name of the Japanese the animated series
Mirai Nikki. Its protagonist, Amano Yukiteru (Togashi Misuzu), is a
loner who is thrown into a battle royale against eleven other
contestants by Deus Ex Machina (Wakamoto Norio). Each contestant is
presented with a diary that foretells the future and must use it to
replace Deus as the new God of Time and Space.