The stage is a private high school, the heroine is a 175 cm sophomore who is good at martial arts. Her favorite TV program is a period drama and her name is Ryoko Mitsurugi. Ryoko's school, Daimon Private High has emphasized the importance of sports activities since it was founded. The school has a unique method for settling problems between students. They make them fight it out in a mode they have dubbed, the "K-system. "K" being the capital letter of "Kenka", which in Japanese means a fight. Ryoko, who is superb with a sword, has long been the champion of K-Fight. She is not that fond of actual fighting but she loves the mental training associated with the martial arts. She gets her relaxation from watching period dramas which she much admires.
Ryoko has easily won all challenges made to her title. This time,too, she beats her opponent and wins a larger budget for her club. But just after the bout, things begin to go wrong.
Suddenly, the world around Ryoko freezes as if time has stopped. A gigantic monster appears. Ryoko tries to escape but she is confronted by a girl dressed as a shaman. The girl orders Ryoko to fight. "Which world is this? "How can she order Ryoko around? Ryoko's wooden sword emits an extraordinary spiritual power which slashes away at the monster. "Where does the mysterious power come from?
The girl speaks to Ryoko who puzzled by this sudden series of mysterious incidents.
"Welcome, Yenen's fighting goddess!"