In the absolute bleakest of pieces, the world is a horrible place and there's nothing anyone or anything can do about it. Endings are bittersweet at best and downright depressing at worst. "Heroes" often have very little heroic about them. Characters that try to instill hope meet grim ends.
...if you need an example, that aptly describes Dark Souls. (And listen, I know I can't shut up about this game recently, but indulge me here because I think it fits the discussion. Very mild spoilers?) For those unfamiliar, this is a game... starring a zombie... who is doomed to eventual insanity... dealing with what is perhaps best described as a magical version of the
heat-death of the universe. Even the gods are scrambling for a solution and they sure as heck don't mind if it means throwing
you under the bus. In fact, everyone is either evil, or adorable but in danger of dying horribly, or manipulating you. Oh, and you're not even the only one they've tried it with--everyone is calling you "Chosen" but you're, like, Chosen #4829, you ain't special. Little is resolved, even less is explained, and whatever you choose, you're never quite given an honest clear 'attaboy saying you did the right thing.
So one wouldn't guess on the surface that this game has this weird habit:
pulling its players out of suicidal depression. Seriously, I didn't have that kind of earth-shattering experience with it, but it's a strangely widespread phenomena that I stumbled across by accident while wiki-walking and such. People apparently routinely find themselves spoken to by this seemingly malicious little video game when nothing else was even cracking the shell.
And it's
because there is so little hope. It's
because it doesn't blind the player with pretty sparkles and try to tell them things aren't so bad. It meets the player where it knows that many obsessive gamers are (sadly) actually
at, and it shows them a wall to beat their heads against, and it says "Now, let's beat our heads against this wall
until it falls down." It acknowledges just how bad things are, willingly flirts with the sickening possibility that maybe there isn't even a point, and then rather than trying to artificially reassure you, it teaches you in baby steps to
derive your own point from the pointlessness you see. That's a very rare thing for popular media to attempt, and if it was set in a hopeful universe, it wouldn't even begin to work.