If you liked
Kono Minikuku mo Utsukushii Sekai
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...then you might like
Sacred Seven
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Both shows have a guy meeting a cute girl and then some transformation / action occurs. When I watched the newer title (Sacred Seven) I just thought... "again?". But if you liked one you'll probably like the other. They have a different plot but follow the same pattern I guess you could say.
If you liked
Akagami no Shirayuki-hime
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...then you might like
+C: Sword and Cornett
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Both stories focuses on a 'royal' family member and their friend/parter (in each manga respectively) in a fantasy world where kings, nobles and servants serve as the political structure of this world. +C has more action in it while Shirayuki Hime is obviously more romantic. But after reading both I enjoyed them both immensely and felt a similar feel to it (largely due to the beautiful character designs and art both of these manga contain).
If you liked
Black Cat
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...then you might like
Number
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Assassins, part of an organisation called Number(s). The main character appears to have a vendetta against a current / ex-colleague. Each assassin within the organisation appears to have their own specific skills and abilities. The main characters also appear to use guns as their main arsenal. Plots are different from the start, but these similar elements may lead one to like one and the other.
If you liked
Mawang Ilgi
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...then you might like
Yami no Matsuei
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Okay, arguably these series are probably completely different from each other. But it's the small elements that can make it attracting to fans of one of these titles for the other. Elements including bishounen, mentor to student relationships, shounen-ai undertones and an engaging and supernatural plot (mostly fantasy in the case of Demon Diary though) underlining both of the series.
If you liked
Kodomo no Omocha
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...then you might like
Nine Puzzle
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The stories are different, but we have the similar plot line of the heroine attempting to understand the 'anti-social bad boy' of the class. And romance / mutual friendship slowly begins to occur. Although Kodocha is much longer and more thorough while Nine Puzzle is like your quick fix.
If you liked
Mai-HiME
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...then you might like
Mushi-Uta
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Yes, both of these stories are extremely different. They have completely different plot lines but they share an underlying similarity. The most obvious would be the presence of creatures that the main characters are able to summon, and do battle with. The cost of defeat comes at a high cost in both series, and because of this much drama and tragedy ensues.
If you liked
Matantei Loki Ragnarok
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...then you might like
Rental Magica
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Extremely similar concepts. Both the series has their own plotline, but follow a monster-of-the-week format (meaning that almost each episode is self-contained) although an ongoing plot often involving the main character is present. Magic, spirits and the like are also present when it comes to the different characters in both of these series combating the antagonists.
If you liked
Death Note
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...then you might like
Spiral: Suiri no Kizuna
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A battle of the brains, mysteries, violence, action, excellent artwork, if you like any of these elements you're bound to find some interest in either Spiral or Death Note. While they both have completely different stories, both of the main characters are highly intelligent individuals able to plot out plans to get things their way. Although the differences between the two are rather minor, surprising plot twists and events are bound to pull you into either Death Note or Spiral: Suiri no Kizuna and leave you wanting for more.
If you liked
Marmalade Boy
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...then you might like
Cherry Juice
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Love triangles that involve step siblings living together, initially not on the right foot, but developments slowly bring them closer together, while outsiders attempt to break them apart. You'll find the usual shoujo elements in these stories, jealousy, the leading character's inability to understand their own feelings, other potential love interests that attempt to pull the siblings apart. If you like one, you may like the other.
If you liked
Rockin'★Heaven
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...then you might like
Five
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Both of these series pretty much have the exact main plotline. They both involve a girl transferring into a new school in an (almost for Rockin' Heaven) all boys class, befriending a group of boys who may or may not have a developing romantic interest in her. Either way, the two main girl slowly falls for the leading male characters, who both seemingly have a dark past behind them to explain their mysterious and two faced nature.
If you liked
Tactics
|
...then you might like
Shounen Onmyouji
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Both shows features a bishounen with a supernatural servant/friend of sorts with a close relationship nearing shounen-ai (although this isn't the case). The main characters are both onmyoujis, and both shows have an arc-based/episodic setting where the characters help others or generally fight to protect themselves from monsters or the antagonists, while having character development present throughout the series.
If you liked
B.O.D.Y.
|
...then you might like
Rockin'★Heaven
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Both of these manga series have similar settings. Both has the main plot line of a girl meeting a guy she initially doesn't get along well with, but ongoing development in their everyday school lives brings them both closer together. Many of the standard romance shoujo elements are present, but any shoujo fan would see this as a strength then a weakness. Both series also comes with excellent artwork.
If you liked
Tokyo Underground
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...then you might like
Kaze no Stigma
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Both of these series involve the characters having elemental super powers (such as fire, earth, wind and etc). The focus and plot line of both of these series are completely different but a different story with similar action may be a refreshing change. Both series also contain some romantic elements, although Tokyo Underground places more importance on this.
If you liked
Harukanaru Toki no Naka de: Hachiyou Shou
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...then you might like
Kiniro no Corda: Primo Passo
|
While both of these shows have completely different settings (La Corda focuses on classical music while Harukanaru is a fantasy and magic anime) they are both anime based on dating sims by the same creators. These two shows are both reverse harems, meaning a female character surrounded by a lot of males. The settings are different by the main focus is still present, that you the viewers will wonder who the female lead will end up with .
If you liked
Fushigi Yuugi
|
...then you might like
Juuni Kokuki
|
Both of the stories have the same base behind them. A young girl taken away to an alternate world that is unlike their own. With people who protect them and hardships both must face in a new world. Unlike Fushigi Yuugi however, Juuni Kokuki focuses on more then one character and can easily be said to develop their fictional world much more better. It would be wise to take note though that while Fushigi Yuugi has a main focus of romance, Juuni Kokuki does not have too many of these romantic elements present.