Angel Beats!, Tasogare Otome x Amnesia Recommendations
The main characters don't remember when or how they died and are curious to find out.
Involves the dead, high school antics, and ultimately moving on.
Both bittersweet, involve the after life, humor, love, sad story plot.
While these two might not have a lot in common at first glance (other than that they're both set in school and are about people, optionally living ones, lol), these two anime get surprisingly similar within the last 1-2 episodes. It's near impossible to explain this sufficiently without spoilers, so I'm just going to say it like this: if you've seen either of the two, the ending of the other will feel fairly familiar and be an equally big feels-trip.
In an abnormal high school setting, the dead, with unfinished business, attempt to remember their life, how they died and try to move on. Both series have heavy supernatural elements, light romance and EXTREMELY similar endings; but Angel Beats has a larger ensemble of characters and more comedy, while Dusk Maiden is a little darker and focuses more on the two main characters.
in both animes the MC are stuck in a world they didn't want to be in all because of their tragic death