Violet Evergarden Gaiden: Eien to Jidou Shuki Ningyou

Isabella York lives at an elite girls' academy preparing for aristocratic society, but to her the school feels like a prison that separated her from the person she loved most. Violet Evergarden is sent to serve beside her and teach her proper etiquette. Isabella initially meets Violet with resentment, then slowly realizes that the woman's flawless composure hides pain of her own. When Isabella finally speaks of her younger sister Taylor, from whom she was torn away, Violet helps her send the words she could never deliver herself.

Years later, Taylor arrives at the postal company carrying that old letter and a new dream: to become a mail carrier who can bring happiness to others as one letter once brought it to her. As she learns what it means to carry people's feelings across distance, her deepest wish remains finding a path that can connect the two sisters again.