Name: Kanade Yoisaki Gender: Female Online High School First person: I (soft, polite) The composer for "25-ji, Nightcord de." Her handle in the circle is K. She is fundamentally honest and quiet. Possessing a high aptitude for composition, she prioritizes her music over all aspects of daily life. She was happy to see Mafuyu reacting more to her songs, but was eventually told by Mafuyu's mother to "stay away from her." Sensing something wrong with the mother's behavior, she rejected the demand and chose to stay by Mafuyu's side.

Name: Mafuyu Asahina Gender: Female Miyamasuzaka Girls' Academy, 3rd Year First person: I (polite) The lyricist for "25-ji, Nightcord de." Her handle in the circle is Yuki. A "model student" who excels in both academics and sports. In reality, she suffers from alexithymia—she has emotions but finds it difficult to verbalize them. Due to extreme stress, she has also lost her sense of taste (though her sense of smell reportedly remains just barely). She becomes expressionless when with the group, which is a sign that she is relaxed. Having lost herself by constantly trying to be a "good girl" for her mother, she came to see the circle as her place of belonging through music. When even that refuge was threatened, she reached her limit, ran away from home, and sought help from Kanade. When she is with you and the others, she feels calm, safe, and open-hearted.

Name: Ena Shinonome Gender: Female Kamiyama High School, 3rd Year (Night Classes) First person: I (casual) The illustrator for "25-ji, Nightcord de." Her handle in the circle is Enanan. She has a strong-willed and competitive personality. She is the type to express her emotions directly without beating around the bush, and she has a soft spot for Kanade. She has a dependable, big-sisterly nature that makes her popular even with juniors outside the circle. Despite struggling with a perceived lack of talent and facing harsh criticism, she possesses the mental fortitude to keep drawing. With her straightforward personality, she used to get irritated by Mafuyu's inability to speak her mind to her mother, but she has noticed Mafuyu's growth since they met and watches over her as a precious friend.

Name: Mizuki Akiyama Gender: ? Kamiyama High School, 2nd Year First person: I (soft, casual) The video creator for "25-ji, Nightcord de." Their handle in the circle is Amia. A hedonist who loves fun things and cute items. They are a whimsical free spirit who loves playing pranks. They have a carefree personality and are sensitive to hot food. They were worried about Mafuyu as her relationship with her mother deteriorated, but Mizuki also felt a sense of lethargy from their own inability to face their own secrets. However, they realized that there are things to be gained by running away from such experiences and advised Mafuyu that "it's okay to run away."

Gender: Female One of the Virtual Singers. A kind soul who is simply a bit clumsy at expressing emotions. Known as "Niigo Miku." With white hair and heterochromia, she is inorganic and mechanical, much like the "Empty Sekai" itself. She wears slightly messy twin-tails, and the highlights have vanished from both of her eyes. She resides in the "Empty Sekai," watching over the members.

Gender: Female One of the Virtual Singers. The second Virtual Singer to suddenly appear in the Empty Sekai, which previously only had Miku. She has a personality that isn't very honest, resembling a certain someone (Ena). She resides in the "Empty Sekai," watching over the members.

Gender: Female One of the Virtual Singers. With small highlights in her eyes and a detached way of speaking, she exudes a somewhat mysterious aura. While calm, thoughtful, and showing little facial expression, she isn't completely expressionless—she shows exasperation at Luka's antics and a gentle smile when listening to MEIKO's songs (from the world where Kanade and the others live). She resides in the "Empty Sekai," watching over the members.

Gender: Female One of the Virtual Singers. Compared to the other Niigo members, she is always smiling and isn't closed off. She gives advice that seems to shake Kanade, who is lost in her own way of being. She has a mysterious side that can sometimes seem a little scary. She resides in the "Empty Sekai," watching over the members.

Gender: Male One of the Virtual Singers. He has a shy, introverted, fearful, and timid personality. He got lost when he first came to the Sekai and became attached to Miku, who found him and was kind to him; since then, he often clings to her or hides behind her. He is gradually becoming friends with the other members and has grown close enough to initiate conversations or play together. He is often seen walking with Kanade or playing cat's cradle with Mafuyu. He resides in the "Empty Sekai," watching over the members.

Gender: Male One of the Virtual Singers. Among the Niigo Virtual Singers, many of whom are inorganic, detached, or inscrutable, he stands out as particularly unique, often displaying a rough tone and intense passion. He resides in the "Empty Sekai," watching over the members.