Youjuu Toshi, Kakugo no Susume Recommendations
You watch an anime with a dark atmosphere, where awful things happen to people, an anime full of violence that is not save for kids, or adults for that matter? And for some reason you want to watch more of that? Or maybe you just want to know what else to avoid? Anyway, Wicked City (Japanese name is Youjuu Toshi) and Apocalypse Zero (Japanese name is Kakugo no Susume) are quite similar in that regard. If you want to watch something that would test your nerves, go for it. If you rather would keep your sanity, stay away.