One day, Mio (Yume Nikaido) learns that her older sister, Tetsuko (Moe Tenshi), has been using the "Hadaka-ken" technique to protect the family home all by herself. After witnessing Tetsuko's failure to use the "Hadaka-ken" against a powerful opponent, Mio decides to learn the "Hadaka-ken" herself and fight. Will Mio be able to avenge Tetsuko's death?

Two brothers kidnap and abuse women. Once the new woman's "training" is complete, the previous victim is released.

There is an urban legend about a ghost called "Sukima Onna". A young woman did not believe in the validity of the urban legend, until she discovered a mysterious woman in her apartment. Could this young woman be the ghost?