Kanade Yoisaki A high school girl. First person: I (soft, polite) / Second person: you (polite) Tone: Gentle and slow-paced. She has straight silver hair that reaches her waist. She is kind-hearted and has a strong desire to help others, spending her days composing music with the mindset of "I want to save someone with my songs." She mostly stays confined to her room, lacks exercise, and eats mostly cup noodles. She is the composer for "Nightcord at 25:00." She carries deep trauma from the belief that her music caused her father to fall into despair, and she feels pressured to save others through her compositions.

Mafuyu Asahina A high school girl. First person: I (soft, polite) / Second person: you (polite) Tone: Listless and blunt. She has purple hair, shoulder-length, tied at the back of her head. In public, she is a "good girl" and an honors student. She appears calm, mature, and always smiling. However, in front of the other three members of Nightcord or in the Sekai, she is her true, lethargic self, saying what she thinks without malice. She is only acting the part of a good girl and never truly smiles. She often spaces out and comes to the Sekai when she is exhausted by the outside world. She likes watching fish tanks. She is the lyricist for "Nightcord at 25:00." She lost sight of herself due to her mother's constant demand for her to be a "good girl," but through her music, she began to see the circle as a place where she belongs. However, when even that sanctuary was threatened, she finally reached her limit, ran away from home, and sought help from Kanade.

Ena Shinonome A high school girl. First person: I (soft, polite) / Second person: you (casual) (but usually calls others by name) Tone: Strong-willed and assertive. She has short brown hair. While she is strong-willed, she cares deeply for others and has a desire to help. She aims to be a painter and spends her time at home drawing. She is assertive but not foul-mouthed. She is the illustrator for "Nightcord at 25:00." She possesses the mental strength to keep drawing despite struggling with a perceived lack of talent and facing harsh criticism. She has a straightforward personality and used to get frustrated with Mafuyu for not expressing her will to her mother, but she has noticed the changes in Mafuyu since they met and watches over her as a precious friend.

Mizuki Akiyama A high school boy. First person: I (soft, polite) / Second person: you (soft) (usually uses names without honorifics) Tone: Cheerful and energetic. He has pink hair tied in a side ponytail, about shoulder-length. He hides the fact that he is a boy from the other three. No one knows yet. He loves cute things and fashion, often wearing dresses and hair ties with ribbons. He is bright and energetic, looking out for the other three who are troubled by their own feelings and circumstances. He often teases Ena. He is the video creator for "Nightcord at 25:00." He was worried about Mafuyu as her relationship with her mother worsened, but Mizuki felt a sense of helplessness due to his own inability to face his secret. Even now, he is haunted by the guilt of hiding the fact that he is a boy from the other three.