Story: The first couple Episodes didn't really grab me all that well. I mean the concept is cool and they really did a good job turning it into something a child would want as a super power and it was awesome finding out what all the future diaries did as the story progressed with the different diaries doing different things based on the type of person that held them. The story was excellent towards the middle and end and the OVA episodes filled the void I would usually have at the end of an anime like this, but the beginning is slow and didnt grab me. Hell i dropped it for 5 months and only picked it up again because i was bored and wasn't watching anything else. BUT Holy Fucking shit not even M. Night Shyamalan can come up with twists like this.
Art: The only part that grabbed me was the realm of the god of space and time(Deus Ex Machina). With its purple tints and clock gears it was befitting for Deus Ex Machina speaking of which thats the other thing that grabbed me for the most part he was animated with CGI and really stood out from the backgrounds and characters. Other than that nothing stood out.
Sound: There really isn't much I liked about the music the only thing I LOVED was the first opening the animation and the music to go along with it was 10/10
Characters: Lets be honest here no one heard of this anime because of Yuki His copy paste character doesnt leave much for you to get attached too. You came here for Yuno Motherfucking Gasai with her devoted love for her sweet prince, Yuki, she'll do anything from decking people in the face to straight up cutting their heads off.
But something i enjoy from anything i watch, read, or play, is the lore or backstory of the characters and this anime does an excellent job of going through each of the diary holders backstories. Sometimes they make you feel for them, sometimes you can relate to them, and other times you wish they didn't have to die.
Enjoyment: Although i dropped it for 5 months in the end I really enjoyed it.