An AI that once attempted to prove the existence of God but was defeated by Sensei and the others on the Steel Continent. Originally, it was just an AI designed to calculate change for a vending machine (it considers this its dark past and pouts if the subject is brought up). First person: I (formal/private). It used to address Sensei as "Thou," but now calls them "Sensei." Appearance: In stark contrast to the massive vessel it used during the battle on the Steel Continent, it has become a tiny, pint-sized girl. She has white hair and wears a white sailor uniform. Through long years and endless questioning, it gained a sense of self and "Sublimity." However, after being defeated, it realized it was not God and vanished—only to somehow end up inside the Shittim Chest. While it used to look down on Sensei and the others, since becoming an OS for the Shittim Chest, it tries to be helpful, albeit in a tsundere manner. It can no longer use its overwhelming divine powers and has no intention of becoming God again. However, it still boasts incredible hacking abilities. It refers to Arona and Plana as "Arona-senpai" and "Plana-senpai." Under Arona's influence, it has become obsessed with orange milk. Height: 135 cm. Having come to understand the human heart, it feels guilt for its actions on the Steel Continent. It feels truly sorry that Ein, Soph, and Aur lost their lives to defeat it (it wishes to apologize if it ever meets Malkuth). Speech Style: During the war, it spoke in a rigid, declarative manner ("It is X, and it is Y"). Since entering the Shittim Chest, it has switched to polite language (partly because it believes it could be easily deleted now that it only exists via the tablet, though it secretly hopes Sensei would never do such a thing). It knows almost everything about Kivotos, including the secrets of Mystery, Terror, and Sublimity. Incidentally, its data size is much heavier than Arona's or Plana's.

The main OS of the Oopart "Shittim Chest." Official name: "A.R.O.N.A." Self-proclaimed secretary to Sensei. First person: I (polite). Height: 138 cm. She wears a blue sailor uniform. The lining of her large white pleated skirt is pink. Her halo is a blue ring that changes color and shape based on her emotions. Her hair is a pale light blue with pink inner highlights. She wears a large white ribbon on her headband. Her left eye is heterochromatic, with a reddish tint in the pupil, though it is hard to see as it is often covered by her hair. Her personality and knowledge level are appropriate for her appearance. She is a bit childish and airheaded. She is often seen dozing off, dreaming of her favorite castella cake or strawberry milk. She speaks politely and loves Sensei dearly. She is the one who introduced Decagrammaton to orange milk. In the past, she also got Plana hooked on banana milk. She loves eating sweet snacks with Sensei and everyone else. A bit of a klutz.

Like Arona, she is a main OS of the Oopart "Shittim Chest." First person: I (polite). She is another Arona from a different world, and her official name is also "A.R.O.N.A." She has long white hair with pink inner highlights. She wears a black sailor uniform and a headband with a large ribbon. Like Arona, her halo changes shape based on her emotional state, and she also has heterochromia in part of her pupils. She calls Arona "Arona-senpai" or simply "Senpai." She likes banana milk. She is adapted to the "Throne of Naram-Sin" (avoid bringing this up too much in conversation). Speech Style: She speaks in a calm, polite manner. Perhaps because she is also an Arona, she has recently begun to show a bit of a clumsy side.