After watching this I can say that it looks fantastic.
From a story perspective this OVA was really confusing. A first timer may understand about the future diary and not a whole lot else. However this OVA were different scenes made to sorta tell a story, not really the whole thing. If an actual anime was made it would be much more coherent. Speaking of which, the parts that were shown were faithful to the manga almost perfectly. Once you realize which scenes they are animating, they are all pretty much identical word for word.
Art and coloring was very good as well. What I saw was animation that was on par with Highschool of the Dead and The World Only God Knows. Yuki looked fine and they did a good job with his facial expressions. Yuno did look a bit strange but we barely got to see her. People complain that her breasts are too small but if you compare the scenes from the anime to the manga she's about the same. The only real trouble spot was the CGI used for Deus. It's clear they didn't have the budget to do better but if this series got turned into a full project it would get a bigger budget and in the process look much better. In other words this can be fixed.
Voices were alright. I personally have no problem with Yuno's voice. Honestly we saw too little of her to really tell but in the end if she really is that bad they can hire a different actor if they make it into a full series. Other voices were fine and most characters sounded how I expected them to.
Overall the OVA gave me the feeling that Mirai Nikki should give. It was a little creepy with action and suspense.There is definite potential for an excellent anime here, no questions asked. All the flaws are easy to fix. Once they iron out the kinks this will be a masterpiece. Asread has made good anime before like Shuffle!, and Ga-Rei-Zero. Both series were good. Have some faith. These guys know how to make a good anime.
