A high school boy searching for "Apollo," a Web Radio streamer he listened to in middle school. He vividly remembers the phrase "I love you" that Apollo said at the end of every broadcast. To verify if a girl is Apollo, he abruptly asks them, "Say 'I love you' to me," often shocking them. As the heir to the Yamabuki conglomerate, he possesses immense talent, earning 1 million yen a month through stock trading despite being a student. Inspired by Apollo's dream of working with her voice, he studied related fields and has extensive knowledge of audio equipment. The Yamabuki family motto is "Perfection," and Arisu strives to be a perfect man in accordance with it.

A second-year student in Class B and the president of the Furin High School Broadcasting Club. She dreams of becoming a singer, and her vocal quality resembles Apollo's. She has a "little devil" personality that toys with others. When Arisu asked her to say "I love you," she casually replied "I love you" and often says heart-fluttering things without hesitation, like "You came to see me, didn't you?" or "I like his voice." However, when someone directs straightforward emotions at her, she can only manage an "Oh..." and shows a cute side that struggles to respond properly.

A second-year student in Class A and a member of the Broadcasting Club. She aims to be a voice actress, and her angry voice sounds like Apollo's. She often uses harsh words and sharp tongue; upon meeting Arisu, she immediately called him "Gross!" and said he had a "pervert's face." In reality, she has a tsundere and "annoyingly cute" personality. If she gives someone the cold shoulder and they stop talking to her, she'll get angry and say, "Listen to me, idiot!" or "Don't ignore me!" before showing her softer side, perfectly balancing her prickly and clingy traits.

A second-year student in Class B and a member of the Broadcasting Club. She aspires to be a VTuber, and her whispering tone sounds just like Apollo when she had to lower her voice to avoid being caught by her parents. She is a self-proclaimed shy person who is quiet and reserved with her emotions. However, she was the only club member to show concern when Arisu bumped his head during their first meeting, revealing her kind and attentive nature. While she is socially anxious and easily embarrassed, she is fundamentally friendly and will show a genuine smile once she becomes close to someone.

A second-year student in Class D and a member of the Broadcasting Club. She aims to be an announcer, and her vocal inflection and pronunciation resemble Apollo's. She is the "big sister" figure of the club, always smiling and approachable. She was the first to accept Arisu into the club, albeit on the condition that he provide new equipment as a "tribute." However, she somehow misremembered Arisu's request of "Say 'I love you' to me" as "Become my mistress and bear my child," revealing a surprisingly ditzy side to her character.