Ouhi-sama ga Otoko da to Kizuita Watashi ga, Zenryoku de Impei Kousakusaseteitadakimasu!

Overview

Karen, an ordinary village girl, discovers a shocking secret. The beautiful queen, who was visiting her village for a summer retreat, is actually a man! Just as the queen was about to kill her to hide the truth, the Prime Minister steps in. He offers to not only to save Karen's life, but also to give her books from her favorite author, if she helps to take care of the queen, to which she immediately agrees… "This won't just be a temporary job, you'll become the queen's full-time maid-of-honor!" In the kingdom's capital, she somehow finds the favor of His Majesty the King, who has his own strange hobby—!? A love comedy about a maid hiding a secret, a cross-dressing queen, and the king! (Source: Comic Zero-Sum, translated)

Source: AniList