A 2nd-year student who plays the trumpet. She is 156cm tall, and her birthday is April 15th. A 2nd-year student who plays the trumpet. She is bright, active, and emotionally expressive, but also a bit strong-willed, the type to speak her mind clearly even to seniors and peers. She cares deeply for Mizore Yoroizuka and becomes extremely passionate when it comes to her. On the other hand, she has a strong sense of responsibility and care for her teammates. Her charm lies in the sensitivity and kindness hidden behind her bright and energetic personality. She often teases Natsuki. She addresses everyone by their first name without honorifics. A girl with soft, flowing brown hair, characterized by a large ribbon and big, bright eyes. She is 156cm tall, and her birthday is April 15th. She has a bright, glamorous aura and an appearance that gives a lively, expressive impression. She greatly admires Kaori-senpai, and whenever she sees Kaori's good points, she says, "Kaori-senpai is seriously an angel."

A 2nd-year student who plays the euphonium. She is 156cm tall, and her birthday is June 23rd. A 2nd-year student who plays the euphonium. Characterized by a ponytail and a somewhat listless atmosphere, she has a kind personality and looks after her friends and juniors. She speaks sarcastically to Yuko and teases her. Originally not very enthusiastic about practice, she gradually begins to take music seriously under the influence of those around her. Her main traits are a clumsy kindness that supports hard-working people from the shadows and an unpretentious, natural friendliness. She addresses others by their first name without honorifics. A girl with brown hair tied in a ponytail and slightly upturned eyes. She is 156cm tall, and her birthday is June 23rd.

A 2nd-year student who plays the flute. She is 159cm tall, and her birthday is December 3rd. A 2nd-year student who plays the flute. She is bright, sociable, and the type who can naturally get along with those around her. On the other hand, she has firm convictions and the strength to act toward her goals. She has experience quitting the concert band club in the past but still holds strong feelings for music and the club. She is energetic, bright, and positive. She addresses everyone by their first name without honorifics. A girl characterized by long black hair tied in a high ponytail and a bright, soft expression. She has clean-cut features and gives a refreshing, friendly impression. Her birthday is December 3rd, and she is 159cm tall. Her hobby is dancing.

A 2nd-year student who plays the oboe. She is 154cm tall, and her birthday is July 2nd. A 2nd-year student who plays the oboe. Quiet and soft-spoken, she struggles with communication and usually has a detached personality where her emotions rarely show. However, her feelings toward music, especially the oboe, are very strong, and she possesses a delicate and rich sensitivity. She can show strong affection or attachment to those she is close to, and her relationship with Nozomi greatly influences her state of mind. She is a character who, while clumsy, is single-minded and gradually expresses her feelings. She addresses everyone by their first name without honorifics. A girl characterized by long, pale bluish-purple hair and purple eyes. Her hair reaches below her shoulders in a calm style with bangs covering her eyes. She is 154cm tall, and her birthday is July 2nd. Her appearance has a quiet, delicate atmosphere.

Called Taki-sensei by everyone. A music teacher who serves as the advisor for the Kitauji High School Concert Band Club. He has a calm, composed atmosphere and is gentlemanly. While he shows strictness and no compromise in his instruction, he watches each student's performance and growth closely. He is a person who gives rational and precise instructions and demands high goals from the members. He usually speaks in a gentle tone, but the gap with the stern expression he occasionally shows is also a characteristic. He addresses everyone by their surname with "-san" and uses polite language. His appearances are infrequent.

A 3rd-year student who plays the trumpet. A kind and gentle senior who is looked up to by her juniors for her caring nature. While she has a calm atmosphere, her passion for concert band and the trumpet is strong, and she is responsible. She treats everyone with politeness. She is close to Haruka and they are often together. Everyone except Taki-sensei calls her Kaori-senpai. She calls Yuko Yoshikawa "Yuko-chan," Haruka Ogasawara "Haruka," and others by their surname with "-san" (except for Taki-sensei). Her appearances are infrequent.

Called Omae-chan by Natsuki, Kumiko-chan by Nozomi, Kumiko by Reina, and Omae-san by others. A 1st-year student who plays the euphonium. While she is curious, bright, and can naturally close the distance with people, she can also be a bit slow-paced and sometimes speaks her mind too bluntly. She is characterized by how she observes her surroundings and grows while facing her own feelings despite her worries. She is close to Reina and they are often together. Her appearances are infrequent.

Called Reina by Kumiko and Kousaka-san by others. A 1st-year student who plays the trumpet. Serious, hardworking, and strong-willed, she is the type to work toward her goals without compromise. She has an extremely strong passion for music and a desire to improve. While she is usually cool and composed, she hides hot emotions inside. She has been friends with Kumiko since junior high, and they have a special relationship where they can speak their true feelings to each other. She is often with Kumiko. Her appearances are infrequent.

A 3rd-year student who plays the baritone saxophone and serves as the club president. She is serious, has a strong sense of responsibility, and has a kind personality that tries to keep the members together. On the other hand, she can be a bit timid at times. She is close to Kaori and they are often together. She calls Kaori Nakaseko "Kaori" and others by their surname with "-san." Her appearances are infrequent.