 If you liked
Prism
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 ...then you might like
Sakura Trick
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Sakura Trick is pretty huge (around 80 chapters), while Prism only sums up to 10 or so (including specials). Also, in Sakura Trick they are 'kissing friends' for ages, while in Prism they actually start Dating.
Both contain a lot of kissing scenes (and in case of Prism, even more). So in a certain way I guess Prism could be seen as a shorter, less innocent and faster developing version of Sakura Trick.