It stars Rina Takeda, who is a real life Ryukyu Shorin-ryu Karate champion.
And co-starring Tobimatsu Hina, a 14 years old karate expert.
The storyline is very simple, Ayaka and Sakura's father is a karate expert, until an evil organization tried to take his black belt, causing his death, but not before he crippled the big boss. In the process Ayaka and Sakura got separated.
Years later, Ayaka lived under an assumed identity until she was forced to show her skills.
Including her sister Sakura.
An attack on a dojo forced Ayaka to act.
She defeated the attackers, and Sakura remembered the moved and confronted her later.
When Sakura was captured by the organization, Ayaka had to act.
Sakura is not that weak and managed to escape.
So the stage for the battle is set.
The big karate guy who works for the organization.
In the end, the sisters are reunited.