Mirai Nikki, or The Future Diary in English, is about a fourteen-year-old boy named Amano Yukiteru and his daily diary he keeps in his phone. Well, it turns out that this "diary" of Yuki's can record the future as in a world of his own imagination, there is a God of Cause and Effect, Deus, who has given twelve future diaries to twelve candidates that can become the new god of this realm. The only way that you can become God, however, is if you can kill the other eleven candidates before they kill you.
Character wise, your main is a little bland and comes off as spineless at first. The cast is composed of some of the following: a yandere (Many know who she is), a terrorist, a super villain like man, and a hinted bisexual detective diary user. It's an interesting cast of characters.
With the dub and licensing, Mirai Nikki has been recently licensed by FUNimation and will be staring Josh Grelle as Yukiteru and Brina Palencia as Yuno Gasai. Personally, I would still watch the Japanese sub but, you never know, this dub may be good.
So, it's kind of like The Hunger Games and the Battle Royale with a one man standing at the end of the game synopsis. Not that it's a bad series, I personally enjoyed the psychological horror elements that it incorporated in. So yes, I would recommend Mirai Nikki.
This is the trailer FUNimation released for the English dub.