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!

Despite many unexpected obstacles, Takane and Hana register their marriage license and are officially married! But when is their actual wedding day going to be? And what's in store for this spirited couple once they move into their own place together? "Happily ever after" is just around the corner!