 If you liked
Onegai My Melody
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 ...then you might like
Heartcatch Precure!
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Both anime follow a similar formula: a character has some problems or is feeling down, then the bad guys steal his/her heart flower and turn him/her into a monster or try to make his dream come true which causes trouble for everyone and it's up to the heroines to defeat the bad guys and turn things back to normal.