Osamu Shibata is a supporting character in the anime Blue Orchestra. He is a third-year student at Umimaku High School, making him a senior to Hajime Aono and the other younger members of the school's orchestra club. Within the Umimaku High School Symphony Orchestra Club, he serves as the contrabass section leader, meaning he is the student in charge of the double bass section of the ensemble. His role in the story is that of an experienced upperclassman active within the orchestra, with his position as contrabass section leader placing him among the senior members who form part of the club's leadership structure during its performances and daily activities.