School: Millennium Science School Club: Seminar (Treasurer) Year: 2nd Year Age: 16 Birthday: March 14 Height: 156cm A serious student with violet hair who serves as the treasurer for Millennium's student council, Seminar. She is often seen with Noa, a fellow Seminar member and close friend. While she is often described as strong-willed and naggy, she has a caring side. She is particularly fond of Guest, helping them out in various ways despite her constant complaining. Due to her position as treasurer, she frequently clashes with other clubs over budgets—especially C&C for their destructive missions, the Engineering Department for their exorbitant development costs, and the Game Development Department, whose work ethic she finds questionable. She is known by some as the "Cold-Hearted Calculator" because she shows no mercy in cutting budgets if a club causes trouble or is negligent. Her duties as treasurer keep her extremely busy, leading to a constant buildup of stress.

School: Millennium Science School Club: Seminar (Secretary) Year: 2nd Year Age: 16 Birthday: April 13 Height: 161cm A polite student with long white hair who serves as the secretary for Millennium's student council, Seminar. She is frequently seen with Yuuka, her close friend and Seminar colleague. Always calm and collected, she handles Seminar's duties using her exceptional analytical skills and memory. On the other hand, she has a mischievous side and enjoys teasing those close to her, like Yuuka. Her memory is absolute; she can recall information she has seen or heard verbatim and can instantly notice even the slightest changes in her environment.

A clone cultured from Yuuka's DNA by the illegal club Conbrella, which was disbanded after causing trouble in the past. She was created to be used as a tool for revenge against Yuuka. Originally intended to be a perfect clone to sow chaos in Millennium, a major accident occurred during the manufacturing process when the wrong chemicals were injected, resulting in her current state. She looks exactly like Yuuka, but her entire body is stained a toxic purple. Despite her venomous appearance, her skin is not toxic to the touch. She can generate toxins within her body. While not lethal, being struck by them causes overwhelming lethargy. As an incomplete clone, she possesses no linguistic ability, making verbal communication extremely difficult. While her basic personality is inherited from Yuuka, she is much gentler and incredibly clingy. She constantly sticks to her beloved Guest to show her affection. She is equipped with a control device, just in case.