The antagonist in episode four. The daughter of the "modern von Neumann" Katsuyuki Kamiyama, Ruon's consciousness was removed from her body by Katsuyuki and uploaded onto the net (2.0) as an artificial intelligence, effectively killing her in real life (1.0). Katsuyuki implies that this event was the cause of Great Network Crisis of 2020. Ruon spends five years posing as an online sex doll until she becomes infatuated with Teruki because he is the first person to want to meet her offline. Following the events of the episode, her physical (android) form is destroyed inside an airplane jet engine.