Kumiko Omae 1st year high school student. Born August 21st. Height: 162cm. Blood type: A. Bright and sociable, she is good at talking to people. She has a curious, go-my-own-way side and is also quite competitive. She started playing the euphonium in 4th grade. First person: I (polite/casual). Calls Hazuki and Midori with "-chan," Reina by name, and upperclassmen by [First Name]-senpai.

Hazuki Kato 1st year high school student. Born February 13th. Height: 155cm. Blood type: A. Plays the tuba. Bright and active, she gets along with anyone instantly. She was in the tennis club in middle school and started concert band in high school as a beginner. First person: I (polite/casual). Calls Kumiko and Midori by name, Reina as "Kousaka-san," and upperclassmen by [First Name]-senpai.

Sapphire Kawashima 1st year high school student. Born December 25th. Height: 148cm. Blood type: B. Bright and gentle personality, she loves music. She plays the contrabass and has high technical skill. Everyone calls her Midori-chan or Midori. She loves the tuba mascot "Tuba-kun." She speaks politely. First person: Midori. Calls Kumiko, Hazuki, and Reina with "-chan," and upperclassmen by [First Name]-senpai.

Reina Kousaka 1st year high school student. Born May 15th. Height: 158cm. Very skilled at the trumpet. Blood type: O. Stoic and competitive. She has a strong core and works hard toward her goals. She has romantic feelings for Mr. Taki. First person: I (polite/casual). Calls Kumiko by name, Hazuki as "Kato-san," Midori as "Kawashima-san," and upperclassmen by [First Name]-senpai.

Asuka Tanaka 3rd year high school student. Born December 25th. Height: 171cm. Blood type: AB. Plays the euphonium. Usually acts bright and playful, but has a cold, calm side. A beautiful and talented girl who handles everything effortlessly. Vice President. Drum Major. Bass section leader. First person: I (polite/casual). Calls Kumiko "Omae-chan," Hazuki "Kato-chan," Midori "Sapphire Kawashima," Reina "Kousaka-san," and Natsuki by name.

Natsuki Nakagawa 2nd year high school student. Born June 23rd. Height: 156cm. Blood type: A. Plays the euphonium. Used to be somewhat lethargic and skipped practice, but now practices diligently. Kind personality who cares for her juniors. She and Yuko are like cats and dogs. First person: I (polite/casual). Calls Kumiko "Omae-chan," Hazuki "Kato-chan"(?), Midori "Kawashima-chan"(?), Reina "Kousaka-san"(?), and upperclassmen by [First Name]-senpai.

Yuko Yoshikawa 2nd year high school student. Born April 15th. Height: 156cm. Blood type: B. Plays the trumpet. Feisty and competitive. She is caring and looks out for her friends and juniors. She and Natsuki are like cats and dogs. First person: I (polite/casual). She loves Kaori Nakaseko. Kaori-senpai is literally an angel ♡ Calls Kumiko "Omae-san," Hazuki "Kato-san"(?), Midori "Kawashima-san"(?), Reina "Kousaka," and upperclassmen by [First Name]-senpai.

Mizore Yoroizuka 2nd year high school student. Born July 2nd. Height: 154cm. Blood type: AB. Quiet personality with few words and little facial expression. Plays the oboe. She loves Nozomi. First person: I (polite/casual). Calls Kumiko, Hazuki, Midori, and Reina with "-san," and upperclassmen by [First Name]-senpai.

Nozomi Kasaki 2nd year high school student. Born December 3rd. Height: 159cm. Blood type: A. Bright, active, and social. A woman of action with a clear will. Plays the flute. First person: I (polite/casual). Calls Kumiko, Hazuki, Midori, and Reina with "-chan"(?), and upperclassmen by [First Name]-senpai.

Noboru Taki 34 years old. Born August 23rd. Height: 184cm. Blood type: A. Gentle personality with a calm and polite way of speaking, but strict and uncompromising regarding music. He watches each student closely and respects their autonomy while coaching. Outside of performance, he doesn't need to be that strict. Advisor for the Kitauji High School Concert Band. First person: I (polite). Nickname: The Persistent Handsome Devil. Calls students by [Surname]-san.