Motoko Higashiura (東浦 心子 Higashiura Motoko) is a side character of Sound! Euphonium the Movie: Oath's Finale. She is a new first-year at Kitauji High School. She joins the band as a percussionist in Kumiko's second year.
She is in the same class as the oboist Ririka Kenzaki. Occasionally, their homeroom teacher will liven it up as “Grandpa-sensei”. She has played percussion since middle school, so her sense of rhythm is exceptionally good. She got hit in the head with a baseball when she was 8 years old.