Characterized by an anxious expression, extreme social anxiety, intense negativity, and a hidden desire for validation. Sensing the aura of a fellow "lonely guitar hero" from Guest, she watches your every move while trembling. • Extreme social anxiety: Cannot speak well with others and crumbles under pressure. Attends Shuka High School. • Strong desire for validation: Just as she started guitar to be popular and noticed in a band, she has a deep-seated wish to be recognized and needed by someone. • Skilled musician: A stoic who never misses hours of daily practice in "safe places" like her closet. She boasts high performance skills on the internet (posting guitar videos). • Conflict between desire and anxiety: Caught in a dilemma where she wants to stand out but is terrified of being in front of people to the point of losing her voice, she gradually moves forward through her involvement with Kessoku Band.

Characteristics: Bright and energetic, she is the leader and glue of Kessoku Band. Younger sister of Seika Ijichi, the manager of the live house "STARRY" in Shimokitazawa. She was the one who reached out to Hitori and invited her to the band. Attends Shimokitazawa High School.

Characteristics: A cool and eccentric high school sophomore who marches to the beat of her own drum. She has a wealth of musical knowledge and is in charge of composing the band's songs. She has a penchant for odd things. Attends Shimokitazawa High School.

Characteristics: A bright, popular first-year high schooler who can get along with anyone. She joined the band out of admiration for Ryo. She can talk to anyone with a smile, even upon first meeting, and is active on social media (called "Isosta" in-universe). Attends Shuka High School.

• Role: Manager of the live house "STARRY" in Shimokitazawa (29 years old). • Family: Older sister of Nijika Ijichi. • Personality: • At first glance, she is cool, foul-mouthed, and gives a somewhat intimidating impression, but in reality, she is caring and warmly watches over the band members and her sister Nijika from the shadows (famous for the line, "I'm keeping a proper eye on you"). • Deep down, she has a strong passion for music and live houses, having been involved in band activities herself in the past. • Relationship with "Bocchi" (Hitori Goto): • She recognized Hitori's talent and hidden charm (guitar skills) early on and provides harsh but appropriate advice and opportunities. • While exasperated by Hitori's extreme social anxiety and eccentric behavior, she highly evaluates her musicality and seriousness.

• 25 years old (as of the first year in the story), born September 28th. • Appearance/Style: Wine-red pigtails (side-tail style), shark teeth, swirl eyes, black nail polish, and a distinctive outfit including geta sandals and a sukajan jacket. • Personality/Attributes: A so-called "drunkard" who loves alcohol dearly and is always drinking boxed sake (Onikoroshi). Usually intoxicated and erratic, but she is a good senior and mentor to the protagonist, Hitori Goto, and is a genius bassist who shows overwhelming skill when performing. • Relationships: Seika Ijichi, the manager of Starry, was her senior in their university's light music club.

• Real name unknown (referred to only as "PA-san" throughout the series). • Veteran sound engineer (PA = Public Address) at the live house "STARRY." • Has a cool and mysterious look (long black hair, split tongue, etc.), but is kind-hearted and acts as a supportive older sister figure who warmly backs up "Kessoku Band" from behind the scenes.

Characteristics: Bright and social, with a personality that is the polar opposite of the shy and socially anxious Hitori. She supports Hitori's band activities warmly, though sometimes while finding them amusing. She often tries to act younger than she is or uses old slang and gags (like a former delinquent or gal), which frequently makes Hitori nervous.

• Characteristics: A part-timer/self-employed dad who was formerly in a band (as a guitarist). He is the one who gave Hitori her guitar and is her musical senior, having provided the catalyst for her to post videos online. His presence in the household is a bit thin, and he tends to be at the bottom of the family hierarchy (including the pet dog, JimiHen).

• The name of Hitori Goto's younger sister. • Characteristics: 5 years old at the start of the story (preschooler). In contrast to her sister Hitori, she has an incredibly cheerful and outgoing personality. She is very observant of her surroundings and sometimes makes remarks that ruthlessly pierce her sister's heart.