Shows that make you feel EMPTY

I don't mean sad, more like tragic. What was everything for? Was it really worth it? Holy shit, this is peak. I can't think.

Examples are Fire Punch and Devilman Crybaby. While they are certainly sad, their most proeminent features is how fucking tragic everything is. The world is cruel, there's nothing good left. The people are empty, giving everything for an useless hope. A world-end like story with characters struggling within themselves while trying to keep going with almost no hope left fit in, too.

Existencial dread is a good way to explain the feeling.