New Lone Wolf and Cub(2003)

Shin Kozure Ookami: Lone Wolf

Ogami Itto, the Lone Wolf, and his nemesis, Yagyu Retsudo, lie dead after their titanic duel. Ogami's young son, Daigoro, stays at his father's side, and none dares help the child—save Togo Shigetada, a samurai on a desperate and deadly mission of his own!

(Source: Dark Horse)