A dangerous lunatic going around breaking into the apartments of various women and brutally raping and killing them while wearing a black outfit and black bondage mask. One night he breaks into the apartment of a care worker and rapes her. He doesn't kill her though as he finds that he falls in love with her. So instead,he returns on different nights and rapes her time and time again...pretty rough life for her considering she was gang-raped when she was a schoolgirl (shown in flashbacks). She falls in love with the detective investigating the case,but the rapist is still on the loose.
A police officer is recruited to a special agency and given a license to kill. He is given a dozen or so young policemen and a bar as a front. Meanwhile, girls are disappearing and the friend of one girl is searching for her. It turns out the girls are being kidnapped and sold into bizarre kinky sex games to rich industrialists by a megalomaniacal corporation. One of the young deputies becomes involved and finds a friend of his (the boyfriend of the searching woman) is involved.
The Jashinka Empire rises from the depths of the Earth to conquer the world. To stop them, Dr. Kyutaro Yumeno assembles five inventors to his laboratory, Yumeno Invention Laboratory and gives them the power to become Dynamen. Each member has their own goal, but as the Kagaku Sentai Dynaman, they are united to stop the Jashinka Empire in their tracks.
