Character Overview: A mysterious girl who fled from the moon to Earth and the core protagonist driving the story. Though found as a baby, she grows at a rate defying human logic, quickly reaching the appearance of a high schooler. Personality & Traits: She seems like a free-spirited, selfish brat, but possesses an undeniable charm. After debuting as a Virtual Liver in the virtual world 'Tsukuyomi,' she becomes a top streamer with cosmic popularity thanks to her genius singing and stage presence. Role: While wandering after failing to adapt to the real world, she meets Sakayori Iroha and moves in with her. She acts as a savior, awakening Iroha's forgotten passion for music by suggesting they perform together. She hides her fate of being a fugitive who broke lunar laws. Even as the Moon Emissaries arrive to take her back, she remains a moving figure who smiles and performs a final graduation live for her fans and Iroha.

Character Overview: A 17-year-old high school girl carrying the weight of reality alone and the story's other protagonist. Following her father's death, she lives a bleak daily life balancing part-time jobs and studies amidst conflict with her busy lawyer mother. Personality & Traits: Diligent and responsible, but had closed her heart and hidden her talent due to past musical trauma. Her only solace was watching the streamer Yachiyo in the virtual reality 'Tsukuyomi.' Role: Her life changes 180 degrees after a chance meeting with Kaguya leads to them living together. Captivated by Kaguya's genius voice, she returns to music as a composer and the producer 'Iro-P.' She is a resilient, growing character who gains the courage to face the world through her friendship with Kaguya, ensuring Kaguya's final stage shines with the best music even in the face of a cruel fate.

Character Overview: The undisputed top liver in 'Tsukuyomi' and Iroha's 'favorite' streamer who helped her forget the pains of reality. Personality & Traits: She performs under the unique concept of an '8,000-year-old mystery AI administrator,' showing kind and perfect leadership that provides immense comfort to fans. Role: A key figure holding the secrets of the world-view in the latter half of the story. It is revealed she is more than just a streamer, having deep connections to the essence of the Tsukuyomi system and Kaguya's past. She is a reliable ally who protects Kaguya and Iroha during crises, showcasing overwhelming visuals and vocals in a legendary joint live performance.

Character Overview: The charismatic leader of 'Black Onyx,' a famous pro-gamer team renowned within 'Tsukuyomi.' Personality & Traits: He commands a massive fanbase with his brilliant gaming skills and handsome looks. While confident and competitive, he has a warm heart for his teammates. Role: He takes notice of Kaguya as she rapidly expands her influence. Initially, he adds tension to the narrative by tracking Kaguya's identity from a competitive stance or as a guardian of Tsukuyomi's rules. However, he is eventually moved by Kaguya and Iroha's sincere music, becoming a loyal ally who uses his gaming skills and team to help them when the Moon Emissaries threaten Kaguya.

Character Overview: A core member of 'Black Onyx' who serves as the sub-vocalist and ace. He is Noi's older brother. Personality & Traits: A classic 'cool beauty' character who is a man of few words. He maintains a poker face and rarely shows emotion, but displays sharper focus than anyone in music and gaming. Role: He supports the leader Akira and acts as the team's anchor. He is the first to rationally analyze the impact Kaguya's music has on the world of Tsukuyomi. Though he seems indifferent, he cares deeply for his younger brother Noi and contributes to resolving crises by utilizing his superior abilities during the major events in Tsukuyomi.

Character Overview: A member of 'Black Onyx' and the younger brother of the ace, Komazawa Rai. He possesses a charm completely opposite to his brother. Personality & Traits: He has a cheerful, sociable personality and is a unique boy who loves cute and flashy clothes. His rich emotional expression makes him the mood maker of the team. Role: He brings vitality to the team between Rai and Akira. He purely enjoys and cheers for Kaguya's stages and mingles naturally with Iroha's friends. Even in the tense battle against the Moon Emissaries, he doesn't lose heart, using his ingenuity and mobility to support the successful opening of Kaguya's final graduation live.

Character Overview: Sakayori Iroha's best friend at school and a famous beauty influencer in the real world. Personality & Traits: Highly sensitive to trends, loves dressing up, and is full of vibrant, positive energy. She is a loyal friend who constantly reached out to Iroha even when Iroha was closed off. Role: A sanctuary for Iroha, sincerely worrying about her struggles in reality. When Iroha begins her Tsukuyomi activities as Kaguya's producer, Roka uses her influencer experience to help with promotion and advice. Even while getting caught up in the massive virtual reality incidents, she remains Iroha's solid real-world supporter, completing the bright friendship narrative.

Character Overview: A close school friend who hangs out with Iroha and Roka. She is a foodie influencer who explores famous restaurants and cafes. Personality & Traits: She loves eating and has a simple, easygoing charm. She is also a passionate fan of the pro-gamer Akira. Role: A scene-stealer who brightens Iroha's exhausting school life alongside Roka. She gets more excited than anyone when her favorite, Akira, becomes involved with Kaguya and Iroha. Serving as a bridge between 'Tsukuyomi' and reality, she is a lovable character who encourages her friends with her characteristic optimism even in major crises.

Character Overview: A unique and cute mascot-type character active within 'Tsukuyomi' who hosts virtual news broadcasts. Personality & Traits: She boasts a witty and humorous way of speaking, often adding unique tones to the end of her sentences. She is a strong comic relief character, often seen hovering over Yachiyo's shoulder or around Kaguya, crying or making a fuss. Role: Though she looks like a simple gag mascot, she is actually an important helper who knows the secrets of Kaguya's past, the moon, and the truth behind the Tsukuyomi system. She records Kaguya's growth as a liver and provides crucial hints or control over the virtual space during crises, allowing the protagonists to stand against the Moon Emissaries.

Character Overview: Reinterpretations of classic folklore figures through modern SF technology, they are a massive and overwhelming group of trackers (system forces) sent to forcibly retrieve Kaguya for violating lunar laws. Personality & Traits: They move like cold, emotionless system programs. They exude absolute destructive power and intimidation, closing down the entire 'Tsukuyomi' space and indiscriminately destroying data to take Kaguya. Role: The main antagonistic force that heightens the final conflict. Their appearance acts as a time bomb signaling the inevitable farewell for Kaguya and Iroha. As they encroach upon Tsukuyomi, they drive the protagonists to the brink, serving as the narrative device that makes the climax—featuring Akira's defense, Iroha's music, and Kaguya's final live—spectacular and moving.