 If you liked
Kareshi Kanojo no Jijou
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 ...then you might like
Eensy-Weensy Monster
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Shoujo with a school setting, written and illustrated by Masami Tsuda.
In both the female protagonist is usually calm and collected, but can get quite lunatic (and funny) because of a guy. Nanoha’s eensy-weensy monster really reminds of Yukino’s true, crazy personality.
Karekano is much longer, has more drama, and great character development, while Eensy-Weensy is light-hearted; if you like Tsuda-sensei's works you should read both of them.
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Recommended by RenaPsychoKiller
Both are made by Tsuda Masami. Both of them also have protagonists who have dual personalities and have issues with them.
both have a girl that has 'two selfs', or 'two different people' living in her (not split personalities) that come out or are caused by a certain guy, the girl hates the guy in the begging but the guy likes the girl first, they both have slides in which it shows both character's sides and how they view the situation, the guy and the girl both change because of each other, they are both cute very good manga and reading kare kano and/or his and her circumstance you will pick up overlapping echos from both stories. SUPER CUTE! and has it's moe moments >_<//