These are some anime schools that most would not want to attend for multiple reasons such as high levels of bullying, insanely strict rules, life-threatening situations, and more. Feel free to give me suggestions
If the anime was never completed, Then you're in luck. You can continue the story by reading the completed manga. This list has basically the same rules as a couple of my other ones, includes anime originally based on a manga, no...
2D/semi-2D donghuas that the story is set in the modern universe or other universes but based on the modern or futuristic universe.
These are anime that are not for the faint of heart and will really take you on a journey to the more dark or mature side of anime. These anime may include (but aren't limited to): Hella gore; insanity; drug abuse; nudity...
This is just a list of anime with dark and/or gloomy atmospheres and themes with explicit content (some more than others).
Anime series, OVA's and movies I've seen that I felt were a huge disappointment, or just plain dumb. Stay away. Not necessarily the worst out there, but bad enough. Note, these are only the ones I've managed to finish...