Cursed to be a ugly cat--but maybe you're happy! ? "I'll have my sister turn into a cat." Marie, daughter of Viscount, who had her fiancée stolen by her younger sister Emilia, and was further cursed. Her reflection in her mirror - a ugly cat! ? Although she escaped from her sister for her life, She was Marie who collapsed from loneliness and hunger without speaking, Her gentle hand reaches out there. "In this kind of rain, poor thing... do you want to come with me?" Her appearance is rumored to be "a ruthless and undefeated duke" in social circles. It is a happy cat life start where a misfortune girl gets the one and only happiness! 「お姉さまには、猫にでもなってもらうわ」 妹に婚約者を奪われ、 呪いをかけられた子爵令嬢マリー。 鏡に映った彼女の姿は――ブサ猫！？ 命からがら逃げ出し、 孤独と空腹で倒れ伏したマリーに 優しい手が差し伸べられる。 「こんな雨の中、可哀想に…私と一緒に来るか？」 それは“冷酷無慈悲の無敗の公爵”と噂の人物で――。 不遇の少女が唯一無二の幸せを手に入れる、幸せ猫ライフスタートです！