Middle school 2nd year, Amano Yukiteru, is a boy who has problem making friends. He thinks of himself as a bystander and will always write down everything he sees in a cell phone diary.

Tormented by solitude, Yukiteru began to imagine things like a friend called Deus Ex Machina who is apparently the Lord of Time & Space. Seeing Yukiteru's miserable state, Deus gives him a new ability. His diary will now record events that will happen in the near future. Yukiteru is then forced to participate in a game which the winner will become Deus's successor.

A short OVA that was bundled with the limited edition of the eleventh volume of the manga.

 AnimeRulz is the best site to watch Mirai Nikki OVA SUB and DUB in HD quality.