Ojou-sama, Otona no Kiss no Ojikan desu.

Despite being formally engaged to another man, a young noblewoman finds her heart captivated by someone entirely unexpected: her own devoted butler. Her feelings for him are deeply unrequited, yet she cannot suppress the affection that grows each time he is near. However, her impending marriage demands proper preparation, and fate places her romantic dilemma at the center of her daily life in the most ironic way possible. To ensure she becomes an exemplary wife, she is required to undergo rigorous bridal training under the direct guidance of the very butler she secretly loves. What begins as formal instruction soon evolves into a series of intimate love lessons designed to teach her the nuances of adult romance. Each session pushes her emotional limits, leaving her heart racing and her composure hanging by a thread. The curriculum proves far more stimulating than she ever anticipated, threatening to drive her to the brink of madness as she struggles to maintain her dignity while navigating the overwhelming tension between them.