Shiitagerareshi Reijou wa, Sekaiju no Aruji ni Narimashita  

Shiitagerareshi Reijou wa, Seikaijyu no Omo ni Narimashita, The oppressed daughter became the master of Yggdrasil, 虐げられし令嬢は、世界樹の主になりました

The story revolves around a young woman named Fiora who, despite being born into wealth as a count's daughter, experiences mistreatment from her family. Her fiancé breaks their engagement, and the last keepsake of her late mother, a sapling, is destroyed in flames. However, one day, a mysterious yet captivating man named Arum appears before her. He reveals that he is the incarnation of Yggdrasil, and now Fiora has become his master.