you know that one lighthearted magical girl anime known as puella magi madoka magica? if you're just entering the fandom don't get AHEAD of yourself! Spoiler: madoka magica is totally an adorable fluffy show who knew such a childish looking show could be so dark and twisted. homura has c-ptsd and depression, most of the characters die, and your soul gets ripped out each time you watch it.
It's on my watch list and I plan on getting to it eventually due to how much I've heard about it. I can't say when I'll watch it because I have to buy it on blu-ray/dvd first.