Read Ochiru Tenshi Manga:
A boy's mind get transfered into a beautifull girl's body that fell on him, although his own body seems to be himself. Living her life posing as her, interacting with his independent male self as the girl he likes, trying to do what is right without messing things up for her should the body return to her rightful owner, he gains shocking insights into the deeply flawed existence of the girl he idolizes.
more.. Dealing with her problems, interacting with her surroundings, and fighting her chaotic urges, he comes to understand and accept her as she really is.