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's father makes the deal of a lifetime and moves the Nonomura family into a huge mansion... But what the Nonomuras didn't plan on was Takane moving in with them! Just how are Takane and Hana going to adjust to living together?