Taida no Majo Speechy

Despite possessing exceptional magical talent, the witch Speechy was falsely accused and banished from the royal capital. Twenty years later, the kingdom, on the brink of destruction due to the "Stagnation Disease," seeks to bring her back from the frontier to investigate its cause. The young knight Kuro is tasked with bringing Speechy back. Intrigued by Kuro, Speechy agrees to the mission, but only under certain conditions... This is a story of salvation and revenge between a difficult witch and a long-suffering young knight.

(Source: Natalie, translated)