Total Recommendations: 2
If you liked
Marmalade Boy
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...then you might like
Boku wa Imouto ni Koi wo Suru
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Both are very heart warming storys, where all of the characters are very easy to relate to. Also, both of the series revolve around a couple who are brother and sister (even though in marmalade boy the couple are only step bother and sister!)
If you liked
Kodomo no Omocha (TV)
|
...then you might like
Special A
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Both animes focus on relationships which don't going anywhere for along time, because the couple are unaware they are in love.