Dumped by Saya Saeki on his first date, Ryo Kazama sees the form of Saya who was supposed to have gone home in anger, in the spot where the meteor that disturbed their date fell. Saya wakes up without any memories, and Ryo lies and tells her that they are a couple. Meanwhile, in a mysterious laboratory, their newest weapon went missing, and a search is being conducted. They abduct the real Saya who was on her way home. Who Ryo thought to be Saya, is actually a sophisticated combat bio-replicant, Eve.