Kozure Ōkami - Lone Wolf and Cub
01 Kozure Ōkami: Kowokashi udekashi tsukamatsuru (Lone Wolf and Cub: Sword of Vengeance) (1972) https://trakt.tv/movies/lone-wolf-and-cub-sword-of-vengeance-1972
02 Kozure Ōkami: Sanzu no kawa no ubaguruma (Lone Wolf and Cub: Baby Cart at the River Styx) (1972) https://trakt.tv/movies/lone-wolf-and-cub-baby-cart-at-the-river-styx-1972
03 Kozure Ōkami: Shinikazeni mukau ubaguruma (Lone Wolf and Cub: Baby Cart to Hades) (1972) https://trakt.tv/movies/lone-wolf-and-cub-baby-cart-to-hades-1972
04 Kozure Ōkami: Oya no kokoro ko no kokoro (Lone Wolf and Cub: Baby Cart in Peril) (1972) https://trakt.tv/movies/lone-wolf-and-cub-baby-cart-in-peril-1972
05 Kozure Ōkami: Meifumado (Lone Wolf and Cub: Baby Cart in the Land of Demons) (1973) https://trakt.tv/movies/lone-wolf-and-cub-baby-cart-in-the-land-of-demons-1973
06 Kozure Ōkami: Jigoku e ikuzo! Daigoro (Lone Wolf and Cub: White Heaven in Hell) (1974) https://trakt.tv/movies/lone-wolf-and-cub-white-heaven-in-hell-1974

Could be my favorite of the series. It's just so entraining with some of the best action sequences. Love the duels with the ninja girls and the the finale with the three Warriors. So good. Also the theme of the headmistress ninja succumbing to her motherly nature was a nice touch. I'm sure feminists would love it.