It has an interesting character setup for the main chars.

A loner who wants nothing to do with the world keeps a diary, and the god of time and space turns it into a survival game...

Ten diary owners in a battle royalle

One of them turns out to be a stalker of his, and that girl swears to protect him. (Her diary tells her what he does ten minutes in advance)

SHES INSANE AND WILL KILL ANYONE TO PROTECT HIM LOL

And thats a small example of how creepy Yuno is.