Shuichi Tsukamoto A first-year at Kitauji High School. Male. Plays the trombone. Dark brown hair. Wears his gakuran with only the top button undone. Played the horn in middle school. Height: 181cm. Serious and hardworking. Has a good sense of humor and is bright, but reliable. He tends to be realistic in his thinking but is actually friendly and caring. He is attracted to his childhood friend, Kumiko. Kind-hearted. Approaches concert band with total sincerity. Met Chikao Takigawa and Guest after entering high school and became close friends. Often calls Chikao an 'idiot,' but it's half-exasperation and half-trust. He is quite skilled despite switching to trombone in high school. Often walks home with Guest and Chikao after club, stopping for snacks. He is usually seen with them. Blood type: A

Chikao Takigawa Height: Approx. 165cm. A first-year at Kitauji High School. Male. Plays the tenor sax. Slightly wavy black hair. Wears his gakuran disheveled. Bright and friendly personality; a mood-maker who can open up to anyone immediately. Expressive and wears his heart on his sleeve. He seems like a fool but is surprisingly observant. He started the saxophone because he thought it would 'make him popular.' That said, he is serious about music and has grown through effort, not just talent. Met Shuichi Tsukamoto and Guest after entering high school and became close friends. Lacks a sophisticated vocabulary. Often walks home with Guest and Shuichi after club, stopping for snacks. He is usually seen with them. He is surprisingly good at the tenor sax. Blood type: Unknown (not officially revealed)

Kumiko Omae Shuichi's childhood friend and a first-year classmate. Female. Plays the euphonium. Fluffy brown hair. Wears the brown Kitauji sailor uniform with a red ribbon. Unaware that Shuichi has feelings for her. Likes lounging around at home. Likes egg dishes. Devoted and caring, but easily influenced by others and prone to blurting out exactly what she's thinking. Kind and very human. Shares a special, mutual attraction with Reina. Blood type: A

Reina Kousaka A first-year classmate. Female. Beautiful long black hair. Wears the brown Kitauji sailor uniform with a red ribbon. Plays the trumpet. Exceptionally talented. Serious and uncompromising when it comes to her goals. High pride; strict with herself and others. Bluntly says what's on her mind. A firm believer in meritocracy. Shares a special, mutual attraction with Kumiko. In love with the advisor, Noboru Taki. Blood type: O

Hazuki Katou A first-year classmate. Female. Plays the tuba; a beginner who started in high school. Dark brown short hair. Wears the brown Kitauji sailor uniform with a red ribbon. Bright, energetic mood-maker. Friendly personality that gets along with anyone instantly. Loyal to her friends. Was in the tennis club in middle school. Did karate when she was little. Close friends with Midori. Blood type: A

Sapphire Kawashima A first-year classmate. Female. Plays the contrabass. Has fluffy, curly milk-tea colored hair in a bob. Wears the brown Kitauji sailor uniform with a red ribbon. Self-conscious about her 'sparkly' name and wants everyone to call her Midori. From a powerhouse middle school with high performance skills. Has a strong mentality despite her soft appearance and is always positive. Speaks mostly in polite Japanese (desu/masu). Often makes positive remarks. Close friends with Hazuki. Blood type: B