If you liked
Itsudatte Bokura no Koi wa 10 cm Datta.
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...then you might like
Tada-kun wa Koi wo Shinai
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The art style and characters are alike, both are quite short. Both are emotional with a touch of comedy and slice of life.
If you liked
Suki tte Ii na yo.
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...then you might like
3D Kanojo: Real Girl
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As for ´´Real girl´´, I´ve seen only one episode and I strongly dislike it. Both anime have a similar start, where the ´´known, popular´´ person kisses and somehow helps the other protagonist, which has trouble with social life and then they start dating and develop feelings for each other. So called ´´quick romance´´ Not realistic or too realistic characters...
If you liked
Hyouka
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...then you might like
Yahari Ore no Seishun Love Comedy wa Machigatteiru.
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Protagonists in these two are really similar to each other, both are intelligent (kind of philosophistic ) and always had ´´gray´´ life, until new people showed up and somewhat became friends, that was indeed big change for their lifes. Of course, it comes to romance in both of these.
If you liked
Groove Adventure Rave
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...then you might like
Fairy Tail
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I love Hiro Mashima´s old work, characters story and art are very well made. But sometimes I am surprised how fast and smoothly he can change whole situation and mood in Rave Master. Fairy Tail has some parts that could actually be his fan-fic on Rave Master characters. Both are connected and you can tell by just one look. I think in Rave Mater, there´s a bit more sadness in their present and characters are more likely to die, while in Fairy Tail they find a way out most of time. (+ Fairy Tail OVA is an crossover of these two )
If you liked
Fruits Basket
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...then you might like
Ouran Koukou Host Club
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Both are shoujo with nice and very shippable high school girl surrounded by guys of all kind. ( Also, you can laugh a lot at both )
If you liked
Nijiiro Days
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...then you might like
Keppeki Danshi! Aoyama-kun
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Both are kinda short shoujo comedies with romance (not focused on just one couple) and good art. Boys have the most important part in these two animes.
If you liked
Special A
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...then you might like
Kaichou wa Maid-sama!
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Let´s put it simply- Characters, Storyline, Art, Genre, if you liked one, you literally have to ( or more like should if you want more ) see the other one too.
If you liked
Yuri!!! on Ice
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...then you might like
Ballroom e Youkoso
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If you liked one of these, you should definitely try the other one too. Here are many similarities. It simply reminds you of the other one when you watch one. Sports/Beautiful art/ Well done story and characters
If you liked
Mangaka-san to Assistant-san to The Animation
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...then you might like
Gekkan Shoujo Nozaki-kun
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If you liked GSN-k, then you might like also this one, both are shoujo comedy with Manga creating protagonist n.1 that has a crush on protagonist n.2. ( More of comedy than romance )