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! On vacation in Okinawa, Takane and Hana find their feelings growing stronger as they navigate the awkwardness of being an official couple! When a boating mishap leaves them stranded on an island together, will they be each other's saving grace?