It's just called Violet Eternal Garden Theater Version or Violet Eternal Garden Movie Version.

The theatrical version continues the main plot of the TV version, and continues the story of Violet Evegarden, a young girl who has returned from the war and is engaged in writing letters to people in need in order to understand the meaning of "love". It is likely that the whereabouts of the Major, whom Violet has been missing, will be told in this theater version.

(Overview of the anime version of the plot) In a certain era on a certain continent, the war between the north and the south of the continent has ended. The war that divided the continent into north and south ended, and the world came to peace. Violet, who was a soldier during the war? Eve Garten, who was a soldier during the war, left the army and came to a large port city, carrying the "words" left behind by a person who was very important to her. A large crowd of people was passing through the streets lined with gas lamps.

Violet found a job as a "letter writer" on the street. It was a job of organizing the language according to the client's ideas. She confronts her clients and touches their deep, honest feelings. At the same time, as Violet recorded the letters, she gradually realized the meaning of the "words".