Kai was living a peaceful and secluded life with his special martial arts teacher Gankutsuo, until the day he rescued a beautiful girl, Lee Shuurei, who was tumbling down a waterfall. He has no idea what she means when she asks about a "Tenraimon", but Kai is soon drawn into her problems when her pursuers arrive. Meeting her will change the course of Kai's life!

From Tokyopop:
In a school where martial arts are standard curriculum and disputes are settled by officially recognized duels, Ryoko takes on all comers. As the #1 fighter at Daimon High, Ryoko's battles to defend her position never end and "Finals" take on a whole new meaning.