After the explosive demise of their last subject, scientists must look for a replacement on whom to continue their bizarre experiments with brain-altering drugs.

Asami Usuda stars as twin sisters, down-to-earth Midori and her uninhibited sibling Aoi. Midori is engaged to a successful man and has a promising outlook for a happy life. However, Midori soon finds her life change suddenly after an unexpected turn of events at a love hotel.