Animes with downer or bittersweet endings? (Don't open the comments if you mind spoilers, you've been warned)

I love any kind of ending that will make me cry or feel down through the rest of the week, so I'm looking for recommendations like this. I don't mind being spoiled because it doesn't ruin my experience, but the post is marked as spoiler for obvious reasons. If you want to give details, remember to cover it as well. Thanks in advance!

I don't mind if it's a recent or classic anime, how many episodes it has, or if it's a series with seasons, an ova or a movie. It just needs to fit the requirements of the title post ☺️

I love any kind of ending that will make me cry or feel down through the rest of the week, so I'm looking for recommendations like this. I don't mind being spoiled because it doesn't ruin my experience, but the post is marked as spoiler for obvious reasons. If you want to give details, remember to cover it as well. Thanks in advance!

I don't mind if it's a recent or classic anime, how many episodes it has, or if it's a series with seasons, an ova or a movie. It just needs to fit the requirements of the title post ☺️