Jeeja Yanin stars as an autistic girl (Zen) with powerful martial art skills !!
When Zin, a former girlfriend of a Thai mob boss, falls for Masashi, a Japanese gangster in Thailand, the Thai boss banishes them: Masashi must go back to Japan, and Zin, with her small daughter Zen, must live in the slum. Zen is autistic - but with uncanny swift reflexes. She watches the students at a Muay Thai school next door and Martial Arts movies, absorbing every technique.
She´s now a teenager, and her mother needs chemotherapy. Zin has taken in a chubby kid, Moom, who watches over Zen. They find a ledger with listing of business men, who owe Zin money: They goes to them - one by one - to collect the money in order to pay for Zin´s treatment. Zen, with her martial skills, becomes Moom’s enforcer. A showdown with the Mob Boss is inevitable.