When Zatoichi accidentally met an unknown dying man, who asked him to save an unknown maiden, he felt obligated. He didn't even have to promise. Time and again, he did everything in his power to save the maiden in several occassions. But when he took side on a feudal quarrel, he found himself choosing between which one to honor better: The request of a dying man or the contract he made with one of the gang leaders. You've guessed what he opted. Modern gangsters may have a different code of ethics.