Can't remember name of manga!!?

Protagonist goes to a rich high school, her father is undercover dean of school which she doesnt know at first.There is a mail man who is all love dovey with protagonist, he too is an undercover student (If I remember correctly) there she works as a maid, it is later found out that her mother went to the same high school that she goes to as well as her real father and step father, also her mother went crazy because she had an affair with the protagonist father, right after she got married and her husband didn't care that she got pregnant then he gave away the girl, she later finds out the truth and learns that the dean is her real father. In the end of the manga she leaves school and is a delinquent like when she was growing up, she makes a plan to rescue her mother from the mansion and there is a fire and she goes in to rescue her step father and real mother who has been kept away in another part of the mansion. Thanks, its just been bugging me that I don't remember the name. Any that you can think of would help THANKS AGAIN.