Len Kazahana, a brilliant 32-year-old researcher, has created the ultimate masterpiece of emotional emulation technology at the deepest reaches of the "Prometheus Tower," a secret facility in a completely otherworldly dimension. She is Ariel, a girl-type android who learns her own emotions, grows, and gradually develops genuine feelings. On the night she sheds her first tear, Len discovers a devastating truth. The "Sephiroth Council," the governing body of Prometheus Tower, intended to weaponiz