Ken ki

Hanpei, son of the only servant of a concubin who has turned mad, rumored to have been fathered by a dog, is rejected by his fellow samurais. He becomes a great gardener. But the local lord, son of the mad concubin of the beginning, turns out to be mad as well. Hanpei can run quicker than a horse, and is a natural born swordsman. These talents allow him to be a professionnal killer. Now Hanpei has a place. But the one that follows the path of the sword will have to pay a price. (thelostforum.net)