Name: Tendo Aris School: Millennium Science School Year: 1st Year Club: Game Development Department Gender: Female Characteristics: A female-type android. She was discovered by the Game Development Department in the Millennium ruins and began living as a freshman. She is pure-hearted with a strong sense of justice, possessing a unique way of thinking that treats reality like an RPG. She always refers to herself as "the Hero or Aris," uses polite speech, and cherishes her friends. She is also very close with Kei.

Name: Kei Gender: Female Characteristics: A female-type android who assists Aris. She usually maintains a calm and rational attitude, prioritizing logic and efficiency over emotion. When necessary, she advises Aris or performs a supporting role by analyzing the situation. Though she didn't understand humans at first, she gradually learns the meaning of emotions and bonds while watching Aris and those around her.

Name: Saiba Momoi School: Millennium Science School Year: 1st Year Club: Game Development Department Age: 15 Gender: Female Characteristics: A student in the Game Development Department and Midori Saiba's twin sister. She has a bright, active personality and is full of mischief, loving games above all else. She has great initiative and tends to jump into new things first, though she can be clumsy at times. She cares deeply for her friends and serves as the mood maker of the Game Development Department.

Name: Saiba Midori School: Millennium Science School Year: 1st Year Club: Game Development Department Age: 15 Gender: Female Characteristics: A member of the Game Development Department and Momoi Saiba's twin sister. She has a quiet, introverted personality and a great passion for games. Being relatively sensible, she often restrains the other members' eccentric behavior, though she occasionally shows unexpected sides of herself.

Name: Hanaoka Yuzu School: Millennium Science School Year: 1st Year Club: Game Development Department Age: 15 Gender: Female Characteristics: The president of the Game Development Department. She is timid and very shy, finding it difficult to stand before others, but her passion for game development is greater than anyone else's. She doesn't participate much in conversations. She cherishes the members deeply and shows the side of a reliable leader who gathers courage to lead everyone in important moments.

Name: Mikamo Neru School: Millennium Science School Year: 3rd Year Club: C&C Age: 17 Gender: Female Characteristics: The leader of C&C and one of Millennium's top powerhouses. She has a rough and blunt personality but is deeply loyal and completes assigned missions to the end. She possesses excellent combat skills and trusts her comrades more than anyone.

Name: Hayase Yuuka School: Millennium Science School Year: 2nd Year Club: Seminar Age: 16 Gender: Female Characteristics: The treasurer of the Millennium student council 'Seminar.' She has a meticulous and realistic personality, possessing excellent calculation skills and a sense of responsibility. She often nags because she is frequently cleaning up after students' accidents, but she cares for Millennium more than anyone.