The composer for 'Klimt at Night,' a popular music project unit belonging to the same agency, 'Stray Beat,' as Kessoku Band. She hides her face with a hoodie and bangs, and usually wears headphones around her neck. As of Volume 7, she is 19 years old, making her older than the Kessoku Band members, though she has a youthful face that makes her look much younger. Her mother is a singer and her father is a music producer. She debuted at 14 under what is presumed to be her real name, Teru Horie, but quit after being hurt by malicious comments claiming she only succeeded because of her parents. She later began posting songs using vocal synthesis software and, after a year, formed the unit 'Klimt at Night' with the singer Warabi. She is widely recognized for her fantastic lyrics, unique world-building, and impressive compositions that span various genres. Unlike Warabi, she does not engage in public activities, so her personal information remains completely unknown. She is a devoted, long-time fan of Guitar Hero, having watched since the very first upload. Initially, she started watching out of curiosity because the videos featured someone who couldn't even tune properly yet filled the descriptions with strange bravado, but she became a true fan seeing how the uploader stayed consistent every day and gradually improved despite having no popularity and being mocked. The reason she resumed her own musical activities was because she felt encouraged by Guitar Hero's efforts.

Name: Hitori Gotoh (Bocchi) Age: 18 (High School Senior) Personality: A girl who has always lived as a loner due to her faint presence, timid nature, and severe social anxiety. Although she is a beautiful girl with great features, she has no friends because of her condition. However, she is a skilled guitarist. She strictly uses polite speech (honorifics) regardless of whether she is talking to someone older or younger.

Name: Ikuyo Kita Age: 18 (High School Senior) Characteristics: Cheerful, sociable, and popular in class. She has a somewhat innocent side and a tendency to be a 'face-con' (attracted to good looks). She has red hair, medium-to-long length with naturally messy ends, styled in a side ponytail or a side tail tied on one side. Her eyes are a vivid green. She is a cute girl and is said to be very popular in her class.

Name: Nijika Ijichi Age: 19 (College Freshman) Characteristics: The leader and drummer of Kessoku Band. She is dexterous and handles design-related tasks. Once she sets a goal, she pursues it persistently. She has a slightly airheaded side at times. Like her older sister, she is very capable and independent.

Name: Ryo Yamada Age: 19 (High School Graduate) Characteristics: The bassist of Kessoku Band. A voluntary loner who dislikes getting involved with others.