On one narrow shopping street, pastel dessert café Sugarcloud and moody espresso bar Kuro have waged a petty chalkboard war for two years. When her flawless sister gets engaged and the meddling aunts demand a boyfriend, Mina Aoki blurts that she is dating someone across the street, and rival barista Daichi Kuroda offers to play the part for the price of her secret croissant recipe. Practising to be a couple, the two enemies start to find out who is really behind the chalkboard insults.