Do you yearn for the feeling of having a giant dump taken right in that little thing you called "optimism"? Do you wish for a world so terrible and pessimistic that all you can do to make it better is stop watching? Then go and watch Bokurano. It's like hell had a baby named Anime Hitler and he holocausted your entire family in front of you.
Remember the 9 gorillion.
A group of children staying at a holiday camp discover a mysterious man in a cave filled with computers. There they learn of a new game that the man has been working on, and are given the chance to play. Unbenknownst to them at the time, they have begun a fatal journey of self discovery that will rock the world around them, and then some.
Now go and watch it, it's pretty darn good.