Diana's Dearest Is the Family's Favorite

Story

After traveling back in time, Lia finds herself in the orphanage where she spent her childhood just before Diana, the lost daughter of Duke Ellad, arrives. Remembering with regret how she once ignored Diana's mistreatment in the orphanage, she vows to protect her until her family finds her. The two grow close, and she sees her life unfolding in an unexpected way as she is welcomed into House Ellad with Diana. Will Lia find happiness in her second life, surrounded by love she's never known?

Synopsis via AniList (English).