Ane no Kawari ni, Yomei Ichi-nen to Iwareru Koushaku Shisoku-sama to Konyaku suru Koto ni Narimashita

Edith is an orphaned young woman who endures a life of quiet neglect, treated with cold indifference by her stepparents and stepsister. Her circumstances take an unexpected turn when Lionel, the eldest son of the highly prestigious Count of Granvelle, extends a marriage proposal to her stepsister. However, beneath the surface of this seemingly advantageous arrangement lies a hidden truth that no one anticipates. Through a twist of fate, it is Edith who suddenly finds herself engaged to the nobleman in her stepsister's place. Despite his esteemed lineage, Lionel approaches his new fiancée not with arrogance, but with gentle sorrow. He confesses that he has only one year left to live, apologizing for burdening her with an engagement to someone like him and asking if she can simply bear with the arrangement until his time runs out. What begins as a temporary contract born of tragedy gradually blossoms into something far deeper. As Edith and Lionel navigate their limited days together, their unwavering devotion to one another sparks a beautiful miracle, transforming a fleeting promise into a heartwarming tale of pure love conquering fate.