Kumiko Ōmae remains a peripheral figure within the narrative of *Liz and the Blue Bird*. The film centers entirely on third-year students Mizore Yoroizuka and Nozomi Kasaki, detailing their evolving friendship and musical collaboration as oboe and flute players performing the piece "Liz and the Blue Bird." While Kumiko is present as a member of the same Kitauji High School concert band during this timeframe, she holds no direct role in the central narrative or character arcs. Her appearances are confined to background scenes within the ensemble. The film offers no specific details about Kumiko Ōmae's background, actions, or development beyond her general participation in the band.