Oujo-sama wa Uso ga Osuki
王女様は嘘がお好き
A noblewoman known as the "Perfect Lady" is secretly the former princess of the fallen nation Cedentaria. She receives a marriage proposal from Prince Schwartz, who claims to know the identity of the traitor responsible for her homeland's downfall. In exchange for this information, he offers his hand in marriage. As she becomes entangled with him, the question remains what will become of her.