Kanpeki Sugiru ga Kosando mo Konyaku Hakisareta Reijou wa Ringoku no Outaishi to Musubareru!?

In the prestigious Academy of Magic & Arcana, Sophia stands out as an honor student. Her younger sister, Mia, consumed by jealousy over Sophia's success, has sabotaged three of her marriage proposals. After her latest engagement is ruined, Sophia grows weary of Mia's wrath. Just then, Luke, the crown prince of a neighboring country, reaches out to her. The two quickly bond over their shared love of magic, becoming a hot topic at the academy. Determined to prevent Sophia from finding happiness, Mia prepares to make her move... (Source: MangaPlaza)