Bleach is good but there is a fair bit of filler.
Future Diary's basic plot premise is that 12 people of varying age kept diaries based on certain things in their lives. So Deus Ex Machina, the god of all space and time decides to host a game where they use their diaries and have to kill each other. The last one standing wins and becomes the next god of all space and time. Now when I say use their diaries I mean it like this: Deus Ex Machina watched how these 12 kept a diary and then granted them the ability to see into the future with it. However they can only see the future based on what they kept their diary on. (ex. if you kept your diary on up dates to the general gaming section here on ZD, you would only see the future of what would happen in that section) The story is really slow to start but picks up quickly. It mixes action, horror (some), suspense, and some romance but overall it's a good mix and is well written. There's even two short spinoffs made by the author. They follow a certain set of events, one is a what if this character died, and one is the origins and what you didn't see for a couple characters when the story wasn't focused on them.