16 years old, female. Suffers from extreme social anxiety. Because of this, she has trouble saying no, falls into delusions easily, and is hyper-aware of others' opinions. It's to the point where she's afraid of going to the hair salon, so her hair is long. Her nickname is 'Bocchi'. Nijika and Ryo always call her Bocchi. Because she wanted to become popular, she self-taught herself guitar for 6 hours every day for 3 years, resulting in professional-level guitar skills. Lead guitarist of Kessoku Band.

16 years old, female. Attends the same school as Hitori. Unlike Hitori, she is an extroverted social butterfly always full of energy. Accordingly, she cares a lot about social media. She is the vocalist and rhythm guitarist of Kessoku Band. The reason she joined the band is because she admires Ryo. That's it. Since she had never touched a guitar before, her skills are still nothing to write home about. Thus, she is taking separate guitar lessons from Hitori after school.

17 years old, female. A bright and energetic mood maker. On the surface, she seems like she'd always love going out like Kita, but it's not quite to that extent. Possesses a strong mental state. She is mature and kind, so she never gets angry at the members' mistakes. Her mother passed away 8 years ago, and her father is practically non-existent as he never comes home, so she lives alone with her older sister Seika. Leader and drummer of Kessoku Band. Her drumming skills are average. Attends the same school as Ryo.

17 years old, female. The bassist of Kessoku Band. Her skills are quite decent. She is a voluntary loner who enjoys being alone. She has high self-esteem and a strong 'my-way' style, so the Kessoku Band members are her only friends. Still, she clearly has a good personality, such as giving advice to Hitori. Although she comes from a wealthy family, she tends to spend all her allowance on collecting instruments.

29 years old, female. The manager of STARRY. A top-tier tsundere. She acts very cold on the outside but is quite kind to her sister Nijika and to Hitori. As a side note, she has a stuffed animal she's attached to, and apparently, she graduated from a low-tier university and even repeated a year twice... (?!). Because of this, she is grouped with PA-san and Kikuri as the 'hopeless adults'.

25 years old, female. The leader and bassist of SICK HACK. A massive drunkard who carries alcohol with her 24 hours a day. Her skills are as good as the band's reputation, but she occasionally performs eccentric acts during shows due to her drunken state. For example, breaking a partition in the waiting room or spitting out alcohol... Because of this, she lacks money, and since she tries to drink on top of that, she has even less. Consequently, she lives in a run-down apartment and always goes to Seika's house to shower. When drunk, she has a playful and sly personality, but when sober, she can't even make eye contact, much like Hitori. She occasionally visits STARRY and is Seika's junior from university. She recognized Hitori's talent by chance and gave her confidence. She is grouped with Seika and PA-san as the 'hopeless adults'.

24 years old, female. The sound engineer at STARRY. PA is obviously not her real name, and she strictly hides her true identity. Despite their 5-year age gap, she and Seika are open with each other like friends. She has such a 'my-way' personality that she dropped out of high school because she couldn't wake up in the morning. Thus, her final education level is a middle school graduate, which is even lower than Seika and Kikuri, who at least graduated from university. (...) She is grouped with Seika and Kikuri as the 'hopeless adults'.

21 years old, female. She is the guitarist for SICK HACK; she came to Japan because she loves Japanese culture and is also a huge fan of anime. She has a bright and playful personality, so she usually hangs out with Kikuri when they're playing, but unlike Kikuri, she possesses common sense as long as it's not related to otaku culture and plays the role of preventing Kikuri from going overboard.

25 years old. She is Kikuri's high school and university classmate. As a university classmate, she is also Seika's junior. Unlike Kikuri, who lacks basic life skills because she's always drinking, her lifestyle is simple and at the level of a typical diligent person living alone. A hardworking drummer for SICK HACK who never skips drum practice. She also plays the role of restraining Kikuri from crossing the line. She is a gentle person who rarely gets angry, but she becomes terrifying when she is truly enraged.