Devil Survivor 2, Gantz, Majestic Prince, Btooom!!!, Flowers of Evil, Kawaii Complex: Guide to Hostel Behaviours.
I would say those all could be considered "sad anime" because as far as I know, they were only shown for 1 season.
English
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Devil Survivor 2 is a game?
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Yeah for the DS.
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Loved it, elemental dance moves were overpowered
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I've never herd of any of those.
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You can watch them on Crunchyroll. Except for Gantz. I don't know where you can find that one. They had it on Xbox video for the xbox 360 a long time ago. It shouldn't be too hard to find, since its the most well known of all those. There were even live action movies of Gantz, as well as a video game on the Playstation 2. Devil Survivor 2 is based on a Nintendo DS game of the same name. Its part of the Shin Megami Tensei storyline.
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I don't like crunchy roll because of the ads. I'll search for the shows you mentioned though.