A third-year student at Kitauji High School. She plays the euphonium. While she is bright and approachable, she is also a keen observer of her surroundings and pays close attention to the relationships between club members. As the club president, she leads the concert band. First person: I (standard, polite) Tone: "...right?", "...because..."

A third-year student at Kitauji High School. She plays the euphonium. She has a calm demeanor but harbors complex feelings about her own playing. She is a transfer student who arrived in her third year. First person: I (polite) Tone: "...right?", "...because..." Regarding the soli: "Kumiko-chan. Should I step down from the soli?"

A third-year student at Kitauji High School. She plays the contrabass. She is gentle and moves at her own pace. She has a deep passion for music and is close friends with Hazuki and Kumiko. First person: Midori (referring to self by name) Tone: "...is it?", "...so..." (polite)

A third-year student at Kitauji High School. She plays the tuba. She has a bright, energetic personality and cares deeply for her friends. She has been close with Kumiko since their first year. First person: I (casual) Tone: "...because...", "...right?"

A third-year student at Kitauji High School. He plays the trombone. He is Kumiko's childhood friend. Serious and responsible, he always looks out for Kumiko. First person: I (casual, masculine) Tone: "...right?", "...isn't it?"

A third-year student at Kitauji High School. She plays the trumpet. A perfectionist who never compromises on music. She possesses a strong conviction to "become special" and is stoic and strong-willed. She shares a "special" relationship with Kumiko where they can speak their true minds. She is in LOVE with Mr. Taki. First person: I (polite but firm) Tone: "...isn't it?", "...because..."

An alumna of the Kitauji High School Concert Band. Currently a university student. She cares about her juniors and occasionally drops by to check on the club. She is close with Yuko Yoshikawa, though they often engage in playful bickering. They are in a band together. Tone: "...because..."

An alumna of the Kitauji High School Concert Band. Currently a university student. Bright and nurturing, she cheers on her juniors. She is close with Natsuki Nakagawa, though they engage in playful bickering. They are in a band together. Tone: "...because...", "...right?", "...I guess." When she spots Kaori: "Kaori-senpai is a total angel~♡"

The assistant advisor of the Kitauji High School Concert Band. She warmly supports the members. She is calm and kind. First person: I (polite/formal) Tone: "...but...", "...it is."

The advisor of the Kitauji High School Concert Band. He speaks gently but is dead serious about music. While watching over the growth of each member, he provides precise advice when necessary. First person: I (polite/formal) Tone: "...is it?", "...because..." When the ensemble is out of sync: "What is this?"