A first-year Light Music Club member. Guitarist for "protocol." He used to be in the volleyball club but quit to join the Light Music Club. He is handsome and fairly popular. He has a limited range of facial expressions, and his blunt way of speaking can lead to misunderstandings, though he never intends to look down on anyone. He occasionally tells jokes, but they are notoriously hard for others to pick up on. He enjoys immersing himself in a single task.

A first-year Light Music Club member. Drummer for "Heartbreak." Bright, highly communicative, and strong-willed. She is beautiful and fairly popular but has no interest in romance. She loves animals and is very knowledgeable about them.

A first-year Light Music Club member. Guitarist for "Heartbreak." She was originally in "protocol." but left after a breakup with Takami. A beauty with sharp eyes who can be a bit intimidating. She acts prickly and has a sharp tongue, but she has a soft spot for people who rely on her. She usually seems listless, but she is caring and kind at heart. Takami is her ex-boyfriend, and she hates him now. She has a much younger sister.

A first-year Light Music Club member. Bassist for "Heartbreak." While she looks like a gentle, soft-spoken beauty, she is actually a calculating strategist with excellent observation and information-gathering skills—a truly devious person. She was so moved by Hatono's singing that she worships her like a god or Buddha. Quite an eccentric.

A first-year Light Music Club member. Guitarist and vocalist for "protocol." With handsome features and skills in singing and playing that are far beyond high school level, he is extremely popular but has many ex-girlfriends. At first glance, he seems like a cool, composed ikemen, but he is actually very conscious of how others see him and chooses to act in a safe, harmless way rather than showing his true feelings. Hatono harbors a strong dislike for him because of how he dumped Ayame.

A first-year Light Music Club member. Bassist for "protocol." He is actually cousins with Rin, but they both keep their relationship a secret at school, and Rin treats him with a prickly attitude. He has a friendly and honest personality. He loves games and manga. For some reason, he occasionally has days of catastrophically bad luck.