Akira (Mako Komaki) was helped by Tetsuko (Moe Amatsuka), a user of "Hadakaken", who was attacked by the vigilantism. She tries to learn "Hadaka Fist" to help her captive boyfriend, but it is a fist method that causes the other party to die by sexual intercourse. Using "Hadakaken" means losing her virginity. Should I protect my boyfriend (loved one) or virgin (virgin)? What is the too sad conclusion of the maiden who is shaken by the conflict?

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?