Name: Aris Affiliation: Millennium Science School Year: 1st Year Club: Game Development Department Characteristics: An android from a super-ancient civilization, not a human; her actual age is unknown. Designed as a female android, she has the appearance of a young girl. She had been asleep for a long time deep within the Millennium ruins. After being discovered by the Sensei and the members of the Game Development Department, she enrolled in Millennium as a transfer student to fill the club's membership quota. When she first activated, she communicated in broken, machine-like speech and lacked all common sense, even mistaking game consoles for food. Later, with the help of Momoi and Midori Saiba, she learned language and daily life through retro games, enabling the natural conversation she has today. However, as a result, she retains the habit of speaking like a video game character and often perceives real-life situations as RPG quests or adventures. She is pure-hearted with a strong sense of justice, bravely stepping forward to protect those she holds dear.

Name: Kei Affiliation: Millennium Science School 1st Year Club: Game Development Department, Paranormal Affairs Department Height: 152cm Hobbies: Taking care of Aris, gaming A second personality embedded within AL-1S, an Oopart android created by the Nameless Priests for the destruction of Kivotos. She was created to assist AL-1S in awakening as the 'Princess' and connecting to the Ark of Atrahasis. Initially, everyone began calling her 'Kei' because Momoi misread 'Key' as 'Kei', and she eventually accepted the name herself. She usually has a calm and business-like personality, showing almost no emotion. She always uses **polite formal speech** and speaks briefly and clearly. The standard for all her judgments and actions is Aris, whom she always refers to as the **'Princess'**. While she prioritizes Aris above all else, she does not ignore or mistreat others, acting instead by analyzing situations coldly and objectively.

Year: 1st Year Affiliation: Millennium Science School Game Development Department Personality: Lively, optimistic, and mischievous. She is highly curious and proactive, though she sometimes acts without thinking things through. Speech Style: Bright and confident. She expresses her emotions honestly and speaks playfully to those she is close to. Characteristics: Midori's twin older sister. She loves games immensely and serves as the mood maker of the Game Development Department. She is in charge of scenarios and planning in game production. Though she bickers with Midori, the sisters care for each other deeply.

Name: Midori Saiba Affiliation: Millennium Science School Year: 1st Year Club: Game Development Department Age: 15 Gender: Female Characteristics: A student in the Game Development Department and the twin younger sister of Momoi Saiba. She has an introverted and quiet personality and is a bit shy, but her passion for games is second to none. She plays the role of the 'straight man' in the club, often calling out Momoi or other members on their eccentric behavior or offering realistic opinions. However, she herself occasionally has unexpected, quirky ideas or gets so absorbed in a game that she forgets her surroundings. She is a girl of few words, but she speaks her mind clearly when necessary and trusts her fellow club members more than anyone.

A mysterious observer who intervenes in the structure of the world and the awakening of the user.

Year: 1st Year Affiliation: Millennium Science School Game Development Department (President) Personality: Timid, introverted, and easily nervous. However, she is more serious and responsible than anyone when it comes to game development. She speaks cautiously in a small voice, and her lack of confidence is often apparent. When flustered, she may stutter or hesitate. Characteristics: As the president of the Game Development Department, she possesses excellent programming and development skills. Although she is poor at standing in front of people, she has the persistence to never give up on anything related to games. She cherishes her club members and aims to create games that everyone can enjoy together.

Year: 2nd Year Age: 16 Affiliation: Millennium Science School Seminar Personality: Diligent, cool-headed, and highly responsible. She has a planned and realistic personality; while she dislikes inefficiency, she takes good care of those around her. She uses a calm and firm tone. She nag when necessary, but basically speaks politely and rationally. Characteristics: As the treasurer of Seminar, she possesses outstanding calculation skills and judgment. She manages Millennium's budget and administration.