The Unfinished Engagement Between the Rose and Hyotei

The heroine transmigrates into the world of Prince of Tennis as a wealthy heiress the same age as Atobe Keigo. She and Atobe have known each other since childhood, their families are well matched, and they have long been engaged. But after turning seven, she lived in England with her mother for many years. When her adult soul awakens in this new life, it's just before she's due to return to Japan. She knows how Atobe grows in the original story, and that approaching him too carelessly could change the plot. So she transfers to Hyotei under her mother's surname, hides her engagement, and joins the tennis club as an assistant coach.