A strong-willed high school girl and a hot, young scion of a business empire can't help wanting to outwit each other every chance they get... But could these opposites be conning themselves out of the perfect match?! 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 usual Christmas family celebration gets canceled, so she can't help but feel disappointed at the prospect of spending Christmas Eve alone. Takane decides to ask Hana out to dinner for that night, but then a beautiful medical school student named Rino shows up declaring her love for Takane! Does this mean Hana has a love rival?!