The Sound of the Waves, Shiosai, 潮騒 (1964) dir. Kenjirô Morinaga

Lonely youth Shinji meets Hatsue, a pretty pearl diver, on the beach and the two fall in love. But Shinji has a rival for Hatsue s affections, Yasuo. Yasuo spreads unpleasant gossip about his rival, and Hatsue s father forbids her to see Shinji. But when the boy saves the passengers on a boat owned by Hatsue s father, his luck in love begins to change.