An autistic girl with powerful martial art skills looks to settle her ailing mother's debts by seeking out the ruthless gangs that owe her family money.

When Zin, former girlfriend of a Thai mob boss, falls for Masashi, a Japanese gangster in Thailand, the boss banishes them: Masashi to Japan, and Zin, with her small daughter Zen, to live next to a martial arts school. Zen is autistic, with uncanny swift reflexes. She watches the students next door and Muay Thai movies, absorbing every technique. She's now a teen, and her mother needs chemotherapy. Zin has taken in a chubby kid, Moom, who watches over Zen. Moom finds a ledger listing business men who owe Zin money; he goes to them one at a time to collect in order to pay for Zin's treatment. Zen, with her martial skills, becomes his enforcer. A showdown with the boss is inevitable.—<[email protected]>

In Thailand, during a tense meeting between the Yakuza Masashi and the powerful boss of Thai mafia No. 8, his mistress Zin falls in love for Masashi and becomes his lover. When No. 8 discovers their affair, he orders Masashi that does not know that Zin is pregnant to return to Fukuoka, Japan, alone. She delivers a baby girl named Zen and sooner the doctors diagnose that she is autistic. Zen is raised watching the students of a martial arts school nearby her home and Kung Fu movies on television and she learns how to fight by herself. When Zen is a teenager, her friend Moon uses her accurate reflexes to raise money to help Zin in her treatment of cancer. The snoopy Moon finds a black book with people that owe money to Zin, and he decides to collect the loans with Zen to pay the treatment of Zin. The girl is forced to fight with the henchmen of the businessmen to receive the money, attracting the attention of No.8 that captures Moon to force a meeting with Zin that tells Masashi that he has a daughter and is returning to Thailand.—Claudio Carvalho, Rio de Janeiro, Brazil