Yu Gisa, ranked 1st in the whole school, and me, ranked 2nd. We are rivals and in a hate-relationship. But... our parents thought we were a couple..? Then, trouble struck. "Since you two are a couple, could you sing the celebratory song at the wedding? I'm looking forward to it!" The moment I opened my mouth to refuse— "Yes, we're dating. We'll sing the song for you." ...What? So we have to play couple until we sing that song..? And so, the fake alliance begins.