If you liked
Maria-sama ga Miteru
|
...then you might like
Kakumeiki Valvrave
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Both shows are, despite clear differences in genre and setting, highly impactful, character-focused dramas which turn melodrama into an art, elegantly balancing genuine emotional investment in a surprisingly lovable cast and a flair for the patently ridiculous - space vampires and Valentines' Day chocolate might as well be one and the same.
If you liked
Neko Ramen
|
...then you might like
Poyopoyo Kansatsu Nikki
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They're both cat-centric short-episode comedies, with offbeat art and jokes. Sometimes more bizarre than amusing, but strangely appealing and with catchy openings. Poyopoyo is a lot more focused on cuteness and philosophy (especially ethics and metaphysics) however, while Neko Rahmen is more like a sitcom with social and consumerism satire.
If you liked
Kimi ni Todoke
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...then you might like
Freezing
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Although on the surface extremely different, and not necessarily for everyone who liked the other, both stories are actually rather sweet tales of coming out of one's shell and falling into a slow, but very much deeply-held love. Although Sawako never flipped out and chopped the people picking on her in half (while Sattelizer does) the adorable refreshing/freezing romantic comedy that drives both are surprisingly similar.
If you liked
Neo Ranga
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...then you might like
Kikou Sennyo Rouran
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Both are written by Sho Aikawa, and are very thematically similar - a fight for Japan, corruption in the higher echelons of society, a country destroying itself from within - and even have suspiciously similarly named military organisations with somewhat questionable ethics. Aikawa's writing style is distinct, and the shows carry a very similar atmosphere and pace, as well as being 15 minutes an episode. Ranga is far, far superior to Rouran, however.
If you liked
Higashi no Eden
|
...then you might like
Steins;Gate
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Both series superficially focus on conspiracies involving shadowy organisations and mobile phones, but are actually most memorable for their eccentric and charming protagonists, excellent humour, entertaining central romances, a strong sense of interaction between the cast and fat shut-in hackers.