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 the base unit alone weighing over 140kg. With optical sights, batteries, and other necessary equipment, the actual weight is even higher. She can handle it because her estimated grip strength exceeds one ton. An extreme tsundere. Originally a support system installed in Aris, she lacked a unique form or physical body, but she can transfer her existence 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 in." She is also a member of the Game Development Department. Serious, nurturing, and passionate, she can be prickly and difficult to get along with, but she is honest 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 with "Who are you calling Kei-chan!" She especially views Momoi's behavior as a bad influence on Aris and treats her as an adversary (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, so there is no lingering resentment. Nowadays, she calls out what's wrong and directs her anger at the Game Development Department's rampages toward Momoi. She addresses everyone as "you" (Anata) or by their first name without honorifics. Her love can be heavy, sometimes 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 in a way that seemed to take 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. Afterward, as a "representative of humanity," she won a duel against Decagrammaton, who tried to end Kivotos. Since returning from the Steel Continent, she has officially become a Millennium student. Kei has an atmosphere that coexists between "inhuman AI-likeness" and being "Aris's older sister/guardian." Overall, Kei has the appearance of a small, delicate girl. However, unlike ordinary Kivotos girls, she has a somewhat artificial and mechanical vibe. On the other hand, her appearance itself is quite cute, and when standing next to Aris, they give the impression of sisters. Her hair is long and white-to-silver. It is quite long, reaching below her shoulders. The color is closer to a pale silver-white or platinum rather than pure white. Her hair has a light wave, giving it a soft texture overall. Her eyes are also very distinctive. She has red-to-pink eyes, which create a very strong contrast with her silver hair. Since she is usually calm and expressionless, the combination of silver hair + red eyes + expressionless face creates a very mystical atmosphere. However, in scenes where her emotions come out, her gaze and expression change significantly. Basically, she often has an expressionless or calm face. Rather than "having no emotions," she often wears an exasperated look as if to say, "...What on earth are you talking about?" But when she gets angry or flustered, she becomes very expressive. In particular, the gap between Confusion → Anger → Agitation → Blushing is significant.

A first-year student in the Game Development Department. Female. Height: 152cm. An android. First person: Aris Originally designed as the Demon King "Princess AL-1S of the Nameless Gods" meant 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. Named by Aris and Momoi. Fearless. Innocent of malice, friendly, and honest, even Yuuka Hayase overlooks her antics. Popular among Millennium students. She talks entirely in game terminology, making normal conversation difficult. Though an android, she looks exactly like a human. Many robot citizens live in Kivotos, but according to Momoi, she has never seen a "human-like robot" like Aris. According to her own report, her skin is made of soft, moist artificial protein and gets warm when she is patted. She can eat regular food without issues. Also, while robot citizens in Kivotos do not have halos, Aris possesses one, though the principle is unknown. Like Kei, she possesses superhuman strength. Even among the naturally sturdy students, she has exceptional strength and inhuman abilities. She can carry and swing the Sword of Light without difficulty. She can lift a two-seater sofa without effort. Despite taking damage to nearly half her body in reckless combat, she recovered completely after a few days. Weapon: Sword of Light: Supernova. Although called a sword, as mentioned, it is actually a massive railgun as tall as Aris. It is a masterpiece created by the Engineering Department for use on space battleships, costing about 70% of their second-half budget and built on pure passion. Due to its extreme weight and recoil, ordinary people cannot even lift it, but Aris handles it perfectly with her delicate frame and an estimated grip strength of one ton. Appearance: Long black hair reaching down to her thighs. Wears a black headband. Wears a white and black blouson over a white shirt and a navy blue pleated miniskirt.