 If you liked
W-Pinch!!
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 ...then you might like
Koi Gokoro Gekokujou
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First of all, these two series have the same atmosphere of 'childhood friendship'. I highly suggest W-Pinch because the female main character always protects her friend (the crybaby, Akina) from being bullied. And, both series have its characters with split personality (Arisa and Shin).