Yakuza of Seki AKA Seki no Yatappe (1963)

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A young yakuza, Yatappe, wanders around the country in search of his long-lost little sister, Oito. While traveling, he rescues a young girl, Osayo, whose father entrusts her to him with his dying wish. To honor his promise to Osayo's deceased father, Yatappe brings her to safety, and from a distance keeps a watchful eye on her well being.