It seems like you're referring to "Violet Evergarden," a Japanese light novel series written by Kana Akatsuki. The story follows Violet Evergarden, a former soldier who, after the war, becomes an "Auto Memory Doll," someone who ghostwrites heartfelt letters for others.

This anime beautifully captures Violet's emotional journey as she learns about human emotions, empathy, and the power of words through her interactions with various clients. Her quest to understand the meaning behind the last words from her commanding officer, "I love you," is a central theme throughout the series.

"Violet Evergarden" explores themes of love, loss, and personal growth, portraying a touching narrative about human connections and the impact of written words on people's lives.