Total Recommendations: 2
If you liked
Rockin'★Heaven
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...then you might like
Nagatachou Strawberry
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If you liked Rockin' Heaven you might like Nagatachou Strawberry because they have the same idea of romance. The girl falls for a popular guy and they have troubles along the way. Same idea and both art is really good. Rockin' Heaven is a bit quicker in its story developing though. If you liked one, you'd probably like the other.
If you liked
Sword Art Online
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...then you might like
Btooom!
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They're both about games and how they get stuck in an unknown world where they'll have to fight to survive. SAO and Btooom! are very similar in both their actions, fantasy and both have mature romance. SAO is a bit more easy going in romance though.