A group of ne'er-do-wells live happily in the slums of what is now Tokyo and have a number of adventures: they get drunk and go whoring, revenge themselves on cruel landlords, animate the corpse of a money-lender in order to frighten people. Then they assist at the marriage of a lovely girl and almost kill themselves gambling to provide her with a dowry.
Yoshie Nogami, a factory worker by day, works as a bar hostess at night. She begins a passionate affair with one of her regulars, but his changing demeanor and constant demands for money lead Yoshie down a dark path.
Oichi may have met her match as she vies against the evil beauty that has set her sights on destroying her. She must face numerous other challenges before confronting her greatest rival. While longing to live and love like other women, she realizes that she can never have a normal life, her sword which she holds on to like a security blanket will always come between her and such a life...
At midnight, Yamabe, a killer, escapes from prison. Two years before, bribed by a narcotic smuggler, Yamabe killed a real estate broker. As he was being arrested by detective Negoro, the detective's bullet struck Sakuko, Yamabe's girl friend who attempted to protect him, and crippled her. When Yamabe was sent to prison, Negoro cared for her and they fell in love. Sakuko asked him to marry her, but Negoro was reluctant to take the killer's sweetheart from him. Learning of the relationship of his girl friend and the detective, Yamabe had pledged revenge.
Five descendants of the people showered with Bio Particles by Bio Robots five centuries in the past have become Biomen. They transform with the Bio Brace and fight using their Super Electronic Brains on their masks. Their Bioswords are equipped with sword and gun modes.
