‘A fight to determine the best! A flirty yuri battle begins!’ Kureha Sara, the ultimate ‘Onee-san’ of an all-girl school was challenged by her rival to a showdown. To settle the score between the two of them, before the school’s popularity contest that would start in two months. “Will you become my lover? I’ll prove to you that I’m worthy.” “…What?” She confessed to prove to her that she was worthy of the number one title. And so, their secret relationship began, as they tried to flirt with each other without being seen by anyone. Now, which one of them would be the first to give in?