The story is set in 1890s Siam. Siang is a young Muay Thai warrior and rocketry expert who steals back water buffalo taken from poor Isan farmers by unscrupulous cattle raiders. He is searching for a man with a tattoo who killed his parents.

After accidentally marrying a ladyboy and losing his virginity to her, Captain Muengman must defeat a band of ladyboy terrorists lead by Golden Flower whose intent is to cause harm to normal men and women.