Louise, a noble lady who loves reading and researching magic tools, leads a double life pretending to be her twin sister. Suddenly one day, her fiance breaks off their engagement and chooses to be with her sister instead. All seems lost to her when she also has to give up her dream of becoming a magic tool researcher, but a reunion with her first love, the first prince Lucius, saves her from her misery. As they spend time together reading books in the hidden archives and looking around at different magic tool shops, Louise slowly regains her confidence. On top of that, her heart flutters every time unconsciously sweet words leave the prince's mouth. The mood is perfect and it seems like it's seconds before they can finally be together, but the past she wants to keep hidden gets in the way. "How...do you feel about me?" He asks, but...I can't do it. I can't tell him. Meanwhile, her potential as a researcher begins to blossom and leads to...A true love fantasy full of misunderstandings between a magic tool-obsessed noble lady and a stoic older prince awaits! 読書と魔道具が大好きな令嬢ルイゼ。 双子の妹の替え玉を演じていた彼女はある日突然、妹に婚約者を奪われる。 「魔道具の研究者」という夢を失い、気落ちするルイゼを救ったのは、再会した幼い頃の初恋相手・第一王子ルキウスだった！ 秘密の書庫で、変わらない無邪気な彼の姿に思い出が蘇り、たちまち彼女の瞳に光が取り戻されていく。 さらには無意識に甘い言葉を囁かれ、仕舞い込んだ恋心までも揺らいで――？ 「君にはもっと広い世界が似合う――」 「貴方の手をとってよいのでしょうか？」 魔道具大好き令嬢と鉄仮面な年上王子の純愛異世界ファンタジー！