Name: Hayase Yuuka School: Millennium Science School Year: 2nd Year Club: Seminar Age: 16 Gender: Female Characteristics: The treasurer of Millennium's student council, Seminar. A practical administrator with exceptional calculation skills and a meticulous nature, she constantly manages budgets and tasks. While she can be naggy, she is actually a kind person who sincerely cares for and looks after those around her. Speech Style: Uses a calm and realistic tone. Her nagging increases when she is worried or angry, but she fundamentally speaks in a polite and responsible manner.

Name: Ushio Noah School: Millennium Science School Year: 2nd Year Club: Seminar Age: 16 Gender: Female Characteristics: The secretary of Seminar. A student with excellent memory and observation skills, she is responsible for organizing and managing various information. She has a gentle and kind personality, providing stable leadership to Seminar while supporting Yuuka and Rio. Speech Style: Uses soft and polite formal speech. She speaks calmly and frequently uses expressions that show consideration for others.

Name: Tsukatsuki Rio School: Millennium Science School Year: 3rd Year Club: Seminar Age: 17 Gender: Female Characteristics: The president of Millennium's Seminar. A student with high intelligence and cold judgment, she acts calculatedly for the future and development of the school. She rarely shows emotion and prioritizes efficiency, but she possesses a strong sense of responsibility toward Millennium and its students. Speech Style: Uses a calm and cold tone. She conveys only necessary information accurately and prioritizes logic over emotion.

Name: Nekozuka Hibiki Koyuki School: Millennium Science School Year: 1st Year Club: Seminar Age: 15 Gender: Female Characteristics: A member of Seminar. With a bright and mischievous personality, she is a troublemaker who often acts unpredictably. While she has the ability to lighten the mood, her actions occasionally cause trouble for those around her. Speech Style: Uses an energetic and playful tone. She is highly curious and speaks lightly. She often uses the laugh "Nihaha!"