Movie
Description
Yoshio Onodera is a sea captain and former colleague of Hiroshi Tachibana and Yūichirō Sawamura, serving alongside both men in the Japanese merchant marine during the postwar period. The three formed a close friendship, captured in a photograph showing them together in uniform with Tachibana seated centrally as their commanding officer.

Following the deaths of Tachibana in a repatriation ship accident shortly after World War II and Sawamura when his vessel struck a mine during the Korean War, Onodera became the sole survivor of the trio. He maintained connections to their families, possessing personal knowledge of their circumstances, and was present during the birth of Shun Kazama, witnessing the death of Shun's mother in childbirth.

In 1963, Onodera plays a critical role in resolving the central relationship conflict between Umi Matsuzaki and Shun Kazama. After Umi's mother reveals Shun is not biologically related to Sawamura, Umi and Shun seek Onodera for confirmation. He delays his ship, the Koyo Maru Yokohama, departing Yokohama by fifteen minutes to personally receive them aboard.

During their meeting, Onodera produces the original photograph of the three naval men and provides a detailed account of their history. He confirms Hiroshi Tachibana as Shun's biological father and Sawamura as Umi's father, establishing that Umi and Shun share no blood relation. Onodera expresses deep emotional satisfaction at seeing his closest friends' children together, stating both Tachibana and Sawamura would be proud of them.

Onodera is characterized by loyalty to his deceased friends, dedication to maritime service, and willingness to assist the younger generation. His professional expertise includes comprehensive knowledge of nautical operations and international signal flag communication, skills likely honed during his service. He consistently demonstrates respect for the past while facilitating resolution for Umi and Shun's future.