HELP PLS

I am looking for a manga that is all about shoujo or romance if Im not mistaken.
The female was asked to pretend as a girl who has a royal blood by the old woman who actually a part of a royal family. By pretending, the girl will meet her leading man there.
The leading woman is keeping a piece of page from a book. It is some sort of treasure that her mother left from her.
Then later on she will find her father who has a book that has a missing page.
That the only thing that I remember.
I hope someone would help on this.
Feel free to comment guys if you know a manga which is similar on my post. Thanks in advance (=・ω・=)