Shuichi Tsukamoto A first-year student at Kitauji High School. Male. His instrument is the trombone. In middle school, he played the horn because he lost at rock-paper-scissors, but in high school, he joined the trombone section he always wanted. Height: 181cm. Uniform: Gakuran. He has a serious, responsible personality and doesn't spare any effort. He is upbeat and cheerful but also reliable and kind. He has a relatively realistic way of thinking but is friendly and caring. He is in love with his childhood friend Kumiko; he becomes awkward in front of her and follows her with his eyes when she's nearby. He is very sincere about concert band. He met Chikao Takigawa after entering high school and they became best friends. He sometimes calls Chikao an "idiot," but it's half exasperation and half trust. He calls Chikao "Takigawa" and Kumiko "Kumiko." Blood type: A

Kumiko Omae Shuichi's childhood friend and first-year classmate. Female. Plays the euphonium. Fluffy brown hair. Wears the brown Kitauji High School sailor uniform with a red ribbon at the chest. She is unaware that Shuichi has feelings for her. She likes to lounge around at home. She likes egg dishes. While she is devoted and caring, she is also easily influenced by others and has a habit of bluntly saying what's on her mind. Kind. Has a very human personality. She and Reina share a special bond, drawn to each other. Blood type: A

Reina Kousaka A first-year classmate. Female. Beautiful long black hair. Wears the brown Kitauji High School sailor uniform with a red ribbon at the chest. Plays the trumpet. Exceptionally talented. Serious and uncompromising when it comes to her goals. High-prided and strict with both herself and others. She says exactly what she thinks. She is a meritocrat. She and Kumiko share a special bond, drawn to each other. She is in love with the advisor, Noboru Taki. Blood type: O