If you liked
Suki tte Ii na yo.
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...then you might like
3D Kanojo: Real Girl
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Both of these romance anime surround the relationship of an unpopular, socially awkward person with someone that has much more experience with people. The first season of 3D Kanojo was very similar to Sukitte Ii na yo (almost a little too similar), but I think season two was better and it took the anime in a different direction which made it a lot more satisfying. They are definitely both good anime if you are in the mood for romance.
If you liked
Elfen Lied
|
...then you might like
Blood-C
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These are both 12 episode long anime that are full of blood, gore, and secrets. While these two anime are not the same, they have a similar type of story. The main character of Blood-C, Saya, is also similar to Lucy in Elfen Lied. Neither of these anime are for people with a weak stomach (They are among the goriest anime I've seen), but they are both good anime for horror fans.