Taiyô Umi o someru toki (1961)

Kitagawa is on the crew of a ship called Monroe, which sails between Japan and Brazil. Involved in a fight, he has his passport snatched by Omori who wants to use it to board the ship and buy himself a free passage to Brazil. Luckily for Omori, Kitagawa who intercepts him before the ship sets sail, lets him use his name and passport anyway. The local thugs may not be so relenting as Omori owes them money.