If you liked
Kyou kara Maou!
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...then you might like
Ixion Saga DT
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I've only watched episode 1 of DT so this is what I can say so far: somewhat similar art style Same type of world/kingdom with fighting, magic and flying creatures. The main characters are somewhat similar The main characters ends up in another world in a really weird way and both animes have a little of "crossdressing" too
If you liked
ChäoS;HEAd
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...then you might like
Persona 4 the Animation
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Both have another world-kind of feeling and they have plot and characters that resemble each other. I think they are really related why? Because they both origin from japanese role-playing video game. Similar plot, starts with murder, then the murdering is stopped and the main characters have to find out more like why or how. There is like a fantasy world and the real world and they are mixed together in a really great and original way, I really love both anime
If you liked
Darker than Black: Kuro no Keiyakusha
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...then you might like
Durarara!!
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Same type of dark space and people with special powers. It's also very exciting, with a mysterious plot and also to mention; on a screen in Durarara!! they show a picture of Darker than black Ryūsei no Gemini.
If you liked
Black Cat
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...then you might like
Black Lagoon
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The main weapon is a gun. They are also looking for money in black lagoon. The art and the the surroundings in black lagoon kind of reminds me of black cat. Altso there is a team of both genders as main characters. I think at least this anime is quite similar to Black cat
If you liked
Sensitive Pornograph
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...then you might like
Junjou Romantica 2
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This is also Yaoi with the genre of Romance, Comedy and Drama just like in SP. It's recommended and very famous yaoi anime and manga. The first season though is much better I think
If you liked
Sensitive Pornograph
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...then you might like
Okane ga Nai
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As other has said, this is only Yaoi and not hentai but it's very cute(+ someones getting raped) It includes a man and a boy in a relationship with money in play but it's very romantic too.