Watch Umi no taka (1963) Official Trailer

Katsuragi Hideo was a student at a maritime university when, just before setting off on a long voyage, he found out that his family's agency was on the verge of going bankrupt, due to harassment from a new company run by the yakuza. Conflict breaks out between the companies, and Hideo fights for his family, who had finally managed to find new work.