Ryoujoku Toujou - Maketara Ryoujoku Namachuukei! Hamerareta JK Kakutouka

Rinko, a JK at the local highschool, is a real strong karate girl.
She won the national karate contest this year and is now looking for a new challenge.
One day, one of the members in her club gives her a flier with information about an underground martial arts tournament and she is totally interested!

...It would seem however, that she bit off more than she could chew...

[From DLsite English]