The Mud-Spattered Pure Heart (1963)

Jiro, a young yakuza, and Mami, a diplomat’s daughter, are two young lovers from different worlds. Having met by accident, they soon discover a new life together. But their love is ill-fated. Mami's family will not accept her choice, while leading an honest life seems like an unattainable goal for Jiro. Can there be anything else but a tragic ending?