The lead character, Mao Ran, a person of Chinese origin born and raised in Japan, has been trained in the secret martial art of her family by her drunken lecherous grandfather. Her grandfather has promised her that he'll tell her what happened to her parents to encourage her to train and fight. Without her knowledge, her grandfather signs her up to participate in a televised martial arts competition between female martial artists known as "Prime Mat".


At first glance, Mao Ran is a normal cute girl, but she is a master of a martial arts handed down by Mao family. One day, she is tricked by her grandfather, and forced to take part in the fighting match, "Prime Mat". First, she is reluctant to fight, but fighting against the rivals, she is gradually fascinated by the "fighting".<br><br>
(Source: AnimeNfo)

Mao Lan continues growing into her path in life through what she learns while fighting. Her grandfather thinks that she has grown complacent and decides to train an adversary for her next Prime Mat appearance. Training with her friends and companions Mao Lan slowly advances through life.<br><br>
(Source: AniDB)

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