Mi ni Oboe no Nai Riyuu de Konyaku Haki Saremashita Keredo, Kamen no Shita ga Minikui da Nante, Ittai Dare ga Itta no Kashira?

Catia has always hid her face under a mask during her days at the academy. Now, right in the middle of the graduation party, her fiancé the First Prince calls off their engagement, accusing her of being as mean-hearted as her ugly appearance. But he should've thought twice, because after all, who ever said beneath the mask was an ugly face?