The story is set in England. Malissa and Isadora are sisters in a poor family. One day, Isadora gets to know Malissa is a daughter of a noble family, who are searching for the missing daughter.
Isadora lies she is the missing daughter to get a castle and all the asset of the family instead of Malissa. After getting into the family, Isadora plans to get married to a crown prince in a foreign country. On the other hand, some people doubt Isadora is the missing daughter.
Malissa ends up getting to know she is the real daughter.

This series won the 1970 Shogakukan Manga Award.