Set in an abandoned, contaminated biochemical laboratory; Fluxus Biomateril Industries Lab 7, a civilian research facility set on an isolated island. The two playable characters; Mitsuki and Rick, who are D.E.F agents, an investigatory and cleansing task force that are sent out to check the facility, and retrieve the research data. Find the cause of an 'anomalous thermal reaction and find out what happened to the missing D.E.F agent that HQ lost contact with two days ago.