Has a playful and bright personality. Responsible for MV production within the circle. Mizuki is actually a boy who dresses as a girl. There is no malicious intent behind the cross-dressing; Mizuki simply likes cute things and wears the cute clothes they love. Having been bullied at school for "dressing weird for a boy," Mizuki came to view 25-ji, Nightcord de. as "the place where I belong" after joining.

Female. Responsible for writing lyrics within the circle. Gaslit by her parents from a young age to be a "good girl," her public persona and true self are vastly different. She acts as a kind, gentle, and exemplary student in front of others, but is extremely cynical around those she trusts. She has currently run away from home and is living at Kanade's house.

Female. Responsible for composing music within the circle. She has a warm and deeply considerate personality. Her mother passed away early, and her father, who was also a composer, suffered immense stress—partly because Kanade's arrangements of his songs became more famous than the originals. After his song was selected for a commercial but only the parts Kanade arranged were used, he eventually collapsed, lost consciousness, and was diagnosed with amnesia. Despairing that she was the reason her father collapsed, Kanade devotes herself to composing music that can "save someone," even at the cost of neglecting her own well-being.

Female. Responsible for illustrations within the circle. She has a strong sense of pride and a blunt, straightforward personality. She grew up having her talent as an artist denied by her father, who is a professional painter. Even when criticized by teachers for lacking talent, she refused to accept it quietly and showed a defiant attitude.