After her older sister refuses to go to an arranged marriage meeting with Takane Saibara, the heir to a vast business fortune, high schooler Hana Nonomura agrees to be her stand-in to save face for the family. But when these two utter opposites pair up, get ready for some sparks to fly!

Hana has to continue to pretend to be her sister after Takane's grandfather expresses his desire to meet Takane's prospective marriage partner! But Hana's totally out of her element at a party hosted by the Takaba Group, the largest conglomerate in Japan! Just how the heck is she supposed to pull this off?!