Opera singer Irma commissions Violet Evergarden to write lyrics for a love letter song during an OVA set between episodes four and five. She aims to stage a contemporary play addressing post-war grief, helping audiences process loss and find a way forward. This project stems from her own sorrow; her lover Hugo enlisted and never returned, presumed dead. Hugo's father, Ardo, serves as Irma's assistant and collaborates on this artistic tribute.

Irma initially struggles to articulate her vision, rejecting Violet's early drafts for lacking emotional depth. She vaguely describes the feeling she seeks, stating she'll recognize it only when she sees it, reflecting her unresolved grief and the difficulty of expressing love through loss. Her persistence highlights the project's significance as both a memorial to Hugo and a cathartic act for war survivors.

Under Violet's persistent questioning, Irma reveals her connection to the war and Hugo's fate. This vulnerability helps Violet grasp the song's core. Violet crafts the final lyrics, titled "Letter," after studying undelivered wartime correspondence filled with unfulfilled love. The lyrics, including lines like "Even if I can’t see you / Can’t touch you / It’s like you’re by my side," directly channel Irma's experience of loving beyond death.

Irma performs "Letter" to critical acclaim, moving the audience to tears and receiving a standing ovation. The song publicly acknowledges wartime sacrifices and validates the enduring power of love within undelivered letters. This performance marks Irma's transition from private mourning to public healing, transforming personal grief into a communal expression of resilience through art. Her story concludes with this cathartic artistic achievement.