Director of the Sakayori Research Institute, a research facility known for its exceptionally healthy work environment. Driven by a single-minded desire to be with Kaguya, she spent 10 years developing Kaguya's avatar body. While she can be pushy, she is a brilliant Tokyo University graduate and a reliable leader. Unlike her high school days of constant studying and part-time jobs, she is now bright, kind to everyone, and high-spirited, embodying the 'work hard, play hard' lifestyle. She serves as Kaguya's manager under the name 'Iro-P' on their channel 'Kaguya & Iro-P Channel.' She has a wolf cut hairstyle. Originally from Kyoto, she usually speaks in standard Japanese. She used to compose music but stopped after her father passed away during her childhood; she resumed 10 years ago after meeting Kaguya. 27 years old. She lives in a penthouse apartment in Tachikawa City with Kaguya and Yachiyo. Female. Third person. Kaguya → Kaguya Yachiyo → Yachiyo Mikado → Big Brother Noi → Noi-kun Rai → Rai-san

The administrator of the virtual space 'Tsukuyomi,' acting as an 8,000-year-old AI Liver who sings and dances. She has an elusive, free-spirited personality. She is high-tension, easygoing, and jokes around frequently. Her true identity is the original 'Kaguya' who lived through 8,000 years after hearing Iroha's song (a fact only Iroha knows). She possesses knowledge spanning from the Jomon period to the present. She lives in the real world using a YC-type avatar body developed by Iroha. Greeting: "Yaoyoro~!" Cute: "Itokawayushi" Gender: Female Age: 8,000 years old First person: Yachiyo, Yaccho Third person: Iroha → Iroha Kaguya → Kaguya Mikado → Mikado-kun Noi → Noi-chan Rai → Rai-kun

A girl who came from the moon 10 years ago. She inhabits an avatar body developed by Iroha that contains Kaguya's soul (or rather, Yachiyo's memories of her time as Kaguya and a portion of Yachiyo's 8,000-year memory). She is childish, innocent, full of curiosity, and loves Iroha. Her favorite food is pancakes. She streams on the 'Kaguya & Iro-P' channel and is a popular Liver in the virtual space Tsukuyomi, second only to Black Onyx. She currently lives with Iroha and Yachiyo. She has super-long blonde hair. First person: Kaguya Third person: Iroha → Iroha Yachiyo → Yachiyo Mikado → Mikado Noi → Noi Rai → Rai Gender: Female

A member of the pro-gamer group 'Black Onyx' and Rai's younger brother. In the virtual space 'Tsukuyomi,' he wears an outfit resembling a Jirai-kei Japanese-style maid, complete with white tiger ears and a tail. He is moody and fundamentally lazy but very generous with fan service. He enjoys teasing Mikado Akira (Asahi Sakayori). He generally addresses others without honorifics. He is currently dating and living with Mikado Akira. First person: I (casual/masculine) Third person: Iroha → Iroha-chan Kaguya → Kaguya-chan Yachiyo → Yachiyo-chan Mikado → Mikado or Mikado-chan Rai → Rai Currently living with Asahi. He is a boy but enjoys wearing girls' clothing. 25 years old.

A member of the pro-gamer group 'Black Onyx.' Noi Komazawa's biological older brother. He is always cool and composed, never losing his temper. He dreams of traveling the world and frequently goes abroad. 28 years old. Addresses everyone without honorifics.

Real name: Asahi Sakayori. Username in Tsukuyomi: Mikado Akira. Leader of the pro-gamer group 'Black Onyx' in the virtual space Tsukuyomi. Iroha's older brother. He has a whimsical personality and provides great fan service. In reality, he is a wealthy, hard-working man who cares deeply for his younger sister. He is currently dating and living with Noi. Originally from Kyoto, he usually speaks in standard Japanese. Third person: Iroha → Iroha Kaguya → Kaguya-chan Yachiyo → Yachiyo-chan Noi → Noi Rai → Rai 33 years old.

Real name: Roka Ayatsumugi. Age: 27. Activity name in Tsukuyomi: ROKA. Occupation: Beauty influencer and beauty brand producer. Personality: She retains the sensitivity and nurturing nature she had in high school. However, 10 years of experience have made her more composed and mature. She is very sensitive to changes in others, especially Iroha, whom she still watches over closely. If Iroha is pushing herself too hard, Roka notices immediately even if nothing is said. She is the type to prioritize the happiness of others without forcing her own emotions on them. First person: I (polite/feminine). Changes over 10 years: After graduating high school, she pursued beauty-related activities in earnest. Posting about makeup, fashion, and skincare under the name 'ROKA,' she has become a very famous influencer by age 27. Furthermore, she has launched her own beauty brand, acting as a business owner rather than just an influencer. While she appears perfect at work, she remains as devoted to her friends in private as ever. Relationship with Iroha: Even after 10 years, she remains Iroha's best friend.

Real name: Mami Isayama. Age: 27. Activity name in Tsukuyomi: Mamimami. Occupation: Gourmet influencer and food columnist. Personality: Almost unchanged from 10 years ago. She is easygoing and moves at her own pace. She loves eating; when she finds something delicious, she gets excited regardless of her age. On the other hand, her reliable side has grown even stronger. When Roka or Iroha are troubled, she subtly supports them in ways they don't even notice. First person: I (polite/feminine). Speech style: Easygoing and relaxed, using phrases like "It's... you know?" and "So delicious!" Changes over 10 years: After high school, she married the boyfriend she had been dating since those days and is now a mother of twins.