If you liked
Darker than Black: Kuro no Keiyakusha
|
...then you might like
Mnemosyne: Mnemosyne no Musume-tachi
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Both anime deals with a similar concept: abnormal human beings and a mysterious area (Hell's Gate/Yggdrasil Tree) that makes a huge impact on the characters' thoughts, actions and decisions. Mnemosyne is faster-paced and is intended for a more mature audience. DTB has a muchmore mysterious storyline; however both series are full of action.
If you liked
Haibane Renmei
|
...then you might like
Angel Beats!
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Both anime explore the concept of "Afterlife", and features the characters being trapped in another world due to their regrets from their past lives. Both characters are required to find peace within themselves to be finally set free. Haibane Renmei is much more serious and complex, while Angel Beats! is a lot more comedic and action-packed.
If you liked
Vampire Knight
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...then you might like
Uragiri wa Boku no Namae wo Shitteiru
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Vampire Knight and Uraboku shares similar story elements and themes: characters who possess supernatural abilities, tragic and dark pasts, and of course drama; however, unlike Uraboku, Vampire Knight heavily focuses on the element of romance and uses it to drive the story forward.