1 prequel called mirai nikki mosaic
Mirai nikki nikki mosaic is a manga series based around minene sama. It is pretty interesting. It shows how minene got trapped and also why she wants to become god. Not to mention it explains that the 12th actually captured her in order to get in the religion group led by the 6th.

2 mirai nikki As you all know mirai nikki is focused around yuno and yuki. It is about the 12 diary holders trying to become god. A sad love tale it is at the same time horror and confusing.

3 mirai nikki paradox This one is based around murumuru and akise. The plot is yuno doesn't exist and yuki got hurt therefore murumuru and akise take their places. Murumuru tries really hard to persuade akise to follow her lead so the future won't changa. However once they reach the 6th he rescues her and the future changes big time.

I decided to write a diary in my cellphone like Yukki and I loved it. I would reccommend it to all Mirai Nikki fans. What do you think about my idea. I am so glad that I tried. Now I write in my diary all the time. Just like Yukki. I love it. I think that I am similar to Yukki. Misunderstood, it is difficult for me to make friends. I live in my imaginary world. I do not know what to say in a confusing situation. I hope that you will like it.

Yomotsu is the worst, the most hated by me and the most annoying anime character. I hate him so much. He's showing off and he has got a sack on his head! I don't know how can someone like him. And his shop is so disgusting. He thinks that he's cool and he's not. The shopkeeper is mad and the items are disguisting. He inprisoned poor Minene and danced in front of her. It was really cruel. I feel really sorry for her. Yomotsu is fake and naive. I am so annoyed when I hear him. Minene is so clever and amazing. I will never forgive him. I hate his justice obsession and his self-respect so much. He appears and ruins everything. I don't mean that it is something wrong with self-respect, but he is much to confident. And that killed him. Ha ha ha!