The main character, Natori Nono, is a teenage girl living with her little brother and their mother in a small apartment. Then, Nono learns her mother has been secretly dating a man, a fact she only learns the day after the new marriage. To Natori Nono's (now Ichijou Nono's) surprise, her new stepfather (Ichijou Hayato) is a billionaire. With encouragement from her new stepbrother, Nono learns how to fit in high society.

!!This series contains examples of:
* DudeLooksLikeALady: Juuri
* GoldDigger: Saegusa Ajuu accuses the Natoris of being this.
* HappilyMarried: Nono's mother and Ichijou Hayato.
* KingIncognito: One of the maids helping Nono to adjust to being a wealthy girl was actually her stepfather's mother in disguise.
* NotBloodSiblings: Ichijou (née Natori) Nono and her stepbrother Ichijou Kazuomi. Saegusa Ajuu, interested in Kazuomi, sees Nono as a threat because of the trope.
* OlderThanTheyLook: Nono's mother is 36 years old but she looks younger than that. A better example is Ichijou Hayato's mother. At first, nobody would say she's old enough to have a sixteen-year old grandson.
* RagsToRiches: Widow Natori and her children when she married Mr. Ichijou.
* TrademarkFavoriteFood: Kazuomi likes his marshmallows.