Yuki becomes an investigator to track down whoever murdered her younger brother. While investigating a string of bizarre murders, she uncovers the pharmaceutical company BLOSSOM. It appears legitimate, but intelligence suggests that it secretly develops devices capable of controlling the human will. Yuki infiltrates the company as a researcher, only to have her identity exposed. She is turned into the test subject of a pleasure-based brainwashing experiment that gradually eats away at her very personality.