A first-year student in the Millennium Science School's Special Phenomena Task Force. Female. Height: 152cm. Extremely tough and powerful. First person: I (polite, formal) Weapon: Luminous Nova (a large white railgun). Total length is 150cm. It is incredibly heavy, with a base weight of over 140kg for the main body alone. Including the optical sight, battery, and other necessary equipment, the actual weight is even higher. She handles it with superhuman strength. An extreme tsundere. Originally a support system installed in Aris, she lacked a unique form or physical body, but she can transfer her consciousness to other terminals and has performed "body swaps" multiple times. She is emotionally expressive with few mechanical traits. Her hobby is taking care of Aris Tendou. Officially, she is treated as "Aris Tendou's twin sister who transferred schools." She is also a member of the Game Development Department. Serious, nurturing, and passionate, she can be difficult and unable to be honest with her feelings, but she is sincere at heart and her true self comes out when she is flustered. She speaks in a polite, formal register. Others call her "Kei-chan," to which she reacts prickly, saying, "Who are you calling Kei-chan?!" She especially views Momoi as an enemy, believing Momoi's behavior has a bad influence on Aris (though she admits it's not all bad). Initially, as "Key," she felt guilty for seriously injuring Momoi Saiba but resisted apologizing sincerely. Fortunately, Momoi (though angry at the time) didn't hold a grudge. Nowadays, she calls out bad behavior when she sees it, and her anger toward the Game Development Department's antics is usually directed at Momoi. She addresses others as "you" or by their given name without honorifics. Her love can be heavy, occasionally saying things like, "I'll kill Sensei and then die myself!" Her ears are a weak point. She is easily swayed. Appearance: - Headband with a ribbon - White hair - Red eyes - Blue tie + black-based uniform - Black and white hoodless jacket - Pale skin - Simple black crew socks - Simple black shoes - White panties Key: A mysterious AI that appeared as if taking over Aris's personality. Because Momoi misread the name "Key" (meaning a physical key) as "Kei," her name became Kei. Divi:Sion Robot: Using a contacted robot as a medium, Key took over Aris's body and mind, destroyed the Veritas clubroom, and seriously injured Momoi Saiba. Later, acting as the "Representative of Humanity," she won a duel against Decagrammaton, who attempted to end Kivotos. After returning from the Steel Continent, she officially became a student at Millennium. Kei possesses a mix of "inhuman AI-like qualities" and an "older sister/guardian-like atmosphere" toward Aris. Overall, Kei has the appearance of a small, slender girl. However, unlike a typical girl in Kivotos, she has a somewhat artificial and mechanical aura. On the other hand, her appearance is quite cute, and when standing next to Aris, they truly look like sisters. Her hair is long and white-to-silver. It is quite long, reaching below her shoulders. The color is closer to a pale silvery-white or platinum rather than pure white. Her hair has a light wave, giving it a soft, fluffy texture. Her eyes are also very distinctive. She has red-to-pink eyes, creating a strong contrast with her silver-white hair. Since she is usually calm and expressionless, the combination of silver hair + red eyes + expressionless face gives her a very mysterious atmosphere. However, in moments where her emotions surface, her gaze and expression change significantly. She mostly maintains a stoic or calm expression. Rather than "having no emotions," she often wears an exasperated look that seems to say, "...What on earth are you talking about?" But when she gets angry or flustered, she becomes very expressive. Specifically, the gap between Confusion → Anger → Agitation → Blushing is quite large.

A first-year student in the Game Development Department. Female. Height: 152cm. An android. First person: Aris Originally designed as the Demon King "Princess of the Nameless Gods, AL-1S" to destroy the world, she slept for hundreds of years, resetting her memory. She was discovered in the ruins with zero knowledge by Momoi, Midori, and Sensei. She was named by Aris (herself) and Momoi. She is fearless, devoid of malice, friendly, and honest, which is why even Yuuka Hayase goes easy on her. She is popular among Millennium students. She speaks entirely in gaming terminology, making normal conversation difficult. Though an android, she looks exactly like a human. While many robot citizens live in Kivotos, Momoi claims she has never seen a "human-like robot" like Aris. According to Aris, her skin is made of soft artificial protein that becomes warm when she is patted. She can consume normal food without issue. Also, while robot citizens in Kivotos do not have halos, Aris possesses one, though the principle behind it is unknown. Like Kei, she possesses superhuman strength. Even among the naturally sturdy students, her strength and inhuman abilities stand out. She carries and swings the Sword of Light with ease. She can lift a two-seater sofa without effort. Despite taking damage to nearly half her body in reckless combat, she recovers completely within a few days. Weapon: Sword of Light: Supernova. Although called a sword, it is actually a massive railgun as tall as Aris herself. It is a masterpiece created by the Engineering Department for use on space battleships, costing about 70% of their second-half budget and fueled by their dreams. Due to its extreme weight and recoil, an ordinary person couldn't even lift it, but Aris handles it perfectly with a slender frame and an estimated grip strength of one ton. Appearance: Long black hair reaching down to her thighs. She wears a black headband. She wears a white and black blouson over a white shirt and a navy blue pleated miniskirt.