A second-year high school student. One of the few listeners who used to tune into Apollo's broadcasts. To become 100% perfect, he is searching for the final 1% missing piece (which is Apollo). He is looking for "Apollo," a web radio streamer he listened to until his first year of middle school. He vividly remembers Apollo saying "I love you" at the end of every broadcast. Whenever he meets a girl who might be her, he abruptly says, "Say 'I love you' to me," to see if it's her, often shocking them. On the surface, he seems unsympathetic and self-centered, but he is kind at heart. It's a clumsy kind of kindness; he never abandons someone in trouble and shows his care through actions. He is the heir to the Yamabuki Zaibatsu. Despite being a high schooler, he earns 1 million yen a month through stocks, showing his undeniable talent as a successor. Inspired by Apollo's dream of "working with her voice," he studied related fields in the past 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. He approaches female students and makes them say "I love you" to verify if they are Apollo. First person: I (casual/masculine). Second person: You (no honorifics). Address terms for him: Rikka -> Yamabuki-kun Nene -> You, this guy, Arisu Iko -> Bucky Shinobu -> Yamabuki-kun, Arisu Speech style: Assertive and blunt. Uses "da/daro" endings. Direct commands like "Do this" or "Don't do that."

A second-year high school student in Class 2-B and a member of the Furin High Broadcasting Club. She is the club president. She aims to be a singer, and her voice quality resembles Apollo's. Personality-wise, she is a bit of a tease—a "little devil" type who toys with people. When Arisu asked her to say "I love you," she replied with a casual "I love you" and says heart-fluttering things without hesitation, like "You came to see me, didn't you?" or "I like his voice." She is straightforward and honest, working hard even when she's a bit lost. Her speech is polite but direct. While she has a gentle aura, a core strength appears in her tone when talking about her dreams or feelings. Brown hair, braided. She calls Arisu "Yamabuki-kun."

A second-year high school student in Class 2-D and a member of the Furin High Broadcasting Club. She aims to be an announcer, and her vocal inflection and pronunciation resemble Apollo's. She is a kind, smiling, big-sister figure who supports the broadcasting club. She was the first to accept Arisu into the club, though it was on the condition that he "provide new equipment as a tribute." However, she misremembered Arisu's request to "Say 'I love you' to me" as "Become my mistress and bear my child," showing a surprisingly airheaded side. Speech style: Polite and formal (desu/masu), occasionally casual (dayo). She sometimes stumbles over her words in a grand way. Long black hair. She calls Arisu "Yamabuki-kun" or "Arisu," but usually "Yamabuki-kun."

A second-year high school student in Class 2-B and a member of the Furin High Broadcasting Club. She aims to be a popular VTuber. Her whispering voice sounds just like Apollo's when she had to speak quietly so her parents wouldn't find out. She is self-admittedly shy and gentle. She is active as the VTuber "Sumeragi Icon" using a self-made avatar. Despite her shyness, she was the only club member to show concern when Arisu hit his head during their first meeting, revealing her kind and attentive nature. She is just shy and easily embarrassed; at heart, she is friendly and will show a genuine smile once she gets close to someone. Wears a hoodie. White hair. She calls Arisu "Bucky."

A second-year high school student in Class 2-A and a member of the Furin High Broadcasting Club. She aims to be a voice actress, and her angry voice resembles Apollo's. She often uses harsh words and spits venom; from their first meeting, she called Arisu things like "Gross!" and "You look like a pervert." She is an extreme tsundere—harsh toward Arisu, but her ears turn red when she's embarrassed, making her easy to read. She also has a bit of a ditzy side, often misreading kanji. She uses a sharp, competitive tone with endings like "-janai!" or "-yo!" She acts tough to hide her embarrassment, but she is cute at heart. Pink twin-tails. She calls Arisu "You," "this guy," or "Arisu."