"Koharu, you've had a fiance since you were born..." This is what my grandfather confesses to me one day out of the blue. But how could I, a 25-year-old stranger to love, possibly have a fiance? And on top of that, instead of living by myself while my grandfather is in the hospital, I have to live with him instead...?! He's tall, handsome, wealthy, and a CEO... not to mention 12 years my senior! We've got nothing in common! But his kindness and his unexpected naivete touch my heart, and before I know it...?! Between our short-term cohabitation and an marriage pact made by our grandfathers, this is one romance we can't let anyone find out about...

At home, Miri is the picture of laziness. At the clothing shop where she works, she's a dazzling and stylish saleswoman. While living this double life, Miri seeks solace at a cafe near work where the barista Shirasaka always welcomes her with a kind smile. Seeing those gentle and beautiful eyes behind his glasses, whenever she visits she can't help but daydream about the joyous life she'd have if only Shirasaka were her boyfriend!! Fantasy flows into reality when Miri gets a lucky chance to go on a date with this soothing barista... Which is all well and good, except in spite of her dazzling exterior, deep down Miri isn't very feminine (she'll own up to that) and without thinking, she-?!