Sekai de Yuiitsu no Mahoutsukai wa, Kyuutei Renkinjutsushi to shite Shiawase ni narimasu ※ Hontou no Chikara wa Himitsu desu (Associated Names)

In a world where magic is thought to have disappeared, Fiona inherited the only magic power left. A year ago, she became reclusive after she was betrayed by a friend and her engagement was broken off. By chance, she decided to hide her magic and work in the royal place, but the Crown Prince seems…