If you liked
Pandora Hearts
|
...then you might like
Heart no Kuni no Alice: Wonderful Wonder World
|
Both are inspired by Alice in Wonderland and have mysterious plot-lines with a gruesome/violent twist.
If you liked
Mugen Spiral
|
...then you might like
Genyou no Meizu
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The heroines are girls with spiritual powers that also have a supernatural bishie helping them throughout the story.
If you liked
Petshop of Horrors
|
...then you might like
Deimos no Hanayome
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Both manga feature a collection of separate stories while gradually moving forward with its loose overall plot. Each chapter is a tale regarding the horrors of human nature.
If you liked
The Tarot Café
|
...then you might like
Masca: The Tale of the Great Mage of Hessed
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Fantasy stories where the heroine gains the help of a devil. A mixture of romance, mystery and adventure. Tarot Cafe feels darker than Masca at times, with the latter being more comedic and light-hearted, and has a deeper plotline and background story.
If you liked
100% Perfect Girl
|
...then you might like
Ouke no Monshou
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The similarities and purely due to the stories, and in no way are related to the art styles of the manga/manhwa. The Royal Hieroglyph has been published since the 70's, and so it has the distinctive older shoujo manga art style that may turn off some readers. However, both stories feature the heroine falling in love with a royal (albeit from different periods) and facing a lot of drama in their new lives, whether it be continuous kidnappings, bouts of amnesia, or people simply hoping to steal the girl.
If you liked
Chocolate Cosmos
|
...then you might like
Kinkyori Renai
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High school girls who have problems with love due to their serious/angry faces end up in a student x teacher relationship. Chocolate Cosmos is more light-hearted, and Kinkyori Renai isn't complete yet.
If you liked
Butterfly Kiss
|
...then you might like
Boku wa Kiss de Uso wo Tsuku
|
Girls with a complex about their slanted eyes. Butterfly Kiss is more of the typical shoujo whereas Boku wa Kisu de Uso wo Tsuku is more of a "Cluedo"-esque mystery with pretty art.
If you liked
Zettai Heiwa Daisakusen
|
...then you might like
Reimei no Arcana
|
Both stories start as marriages of convenience between royals in fantasy worlds. The heroines have the feeling of guilt for loving an enemy as they get closer to the heroes. However, Daisakusen is more comedic whereas Arcana appears to be more serious, the latter containing more intrigue within the main plot.